Curable composition

ABSTRACT

The present invention has its object to provide a curable composition which allows slight bleedout of a liquid compound to occur to the cured product and shows good curability and adhesiveness using a non-organotin catalyst, an amine compound, as a silanol condensation catalyst. 
     The present invention relates to a non-organotin-based curable composition which comprises:
     (A) an organic polymer having a silicon-containing group capable of crosslinking by siloxane bond formation, and   (B) a specific amidine compound and/or a guanidine compound having a melting point of not lower than 23° C., as a silanol condensation catalyst.

CROSS REFERENCE TO RELATED APPLICATION

This application is a National Stage of International Application No.PCT/JP2006/319726 filed on Oct. 2, 2006, claiming priority based onJapanese Patent Application No. 2005-288797, filed Sep. 30, 2005, thecontents of all of which are incorporated herein by reference in theirentirety.

TECHNICAL FIELD

The present invention relates to a curable composition which comprisesan organic polymer having a silicon-containing group (hereinafterreferred also to as “a reactive silicon group” in some cases) which hasa hydroxyl group or a hydrolysable group bonded to a silicon atom and iscapable of crosslinking by siloxane bond formation.

BACKGROUND ART

It has been known that an organic polymer comprising at least onereactive silicon-containing group in one molecule has a property ofcrosslinking by siloxane bond formation accompanied with, for example,hydrolysis of a reactive silicon group due to water etc. at a roomtemperature and accordingly giving a rubber-like cured product.

With respect to the reactive silicon group-containing polymer, a polymerhaving a polyoxyalkylene main chain or a polyisobutylene main chain aredisclosed in Patent Document 1, Patent Document 2 and the like and havealready been produced industrially and used widely for uses as asealant, an adhesive, paint and the like.

The curable composition comprising an organic polymer having a reactivesilicon group is cured using a silanol condensation catalyst and,generally, an organotin catalyst having a carbon-tin bond, such asdibutyltin bis(acetylacetonate), is widely used. However, in recentyears, issues have been raised concerning the toxic features oforganotin compounds and, therefore, the development of non-organotincatalysts has been awaited. In Patent Document 3, Patent Document 4,Patent Document 5, Patent Document 6 and Patent Document 7, there aredisclosed tin carboxylate salts and other metal carboxylates salts assilanol condensation catalysts and, further, it is disclosed that theaddition of an amine compound as a cocatalyst or promoter results inimproved curability. Further, from the environmental stress viewpoint,substantially metal-free curing catalysts are favorable and PatentDocument 8 discloses that metal-free silanol condensation catalysts canbe obtained by using an amine compound and a carboxylic acid incombination. However, the use of the non-organotin catalysts raises theproblem that the adhesiveness tend to be inferior as compared with theuse of organotin catalysts.

Patent Document 9 and Patent Document 10 disclose a technology of takingoff the luster of the cured product surface or improving theantistaining properties of such surface by adding an amine compoundhaving a melting point of 10 to 200° C. However, Patent Document 9 andPatent Document 10 describe such amine compound as a flatting agent or astain resistance improving agent but does not describe the function ofthe same as a silanol condensation catalyst but describe, in the examplesection, organotin compounds as such catalysts. On the other hand,Patent Document 11 discloses a technology of attaining improvements inrecovery and creep resistance by adding a guanidine compound to acurable composition comprising a polyoxyalkylene polymer having areactive silicon group and a tetravalent tin-based curing catalyst butgives no description of the guanidine compound functioning as a silanolcondensation catalyst.

Thus, in spite of the fact known in the art that such various physicalproperties as curability, stain resistance and recovery can be improvedby adding an amine compound to a curable composition comprising areactive silyl group-containing organic polymer, there are very fewdisclosures about a catalyst system in which an amine compound is usedsingly as a silanol condensation catalyst. Patent Document 12 disclosesthat an aryl group-substituted biguanide compound such as1-(o-tolyl)biguanide, which is one species of amine compounds, acts as asilanol condensation catalyst. Patent Document 13 discloses that DBU(1,8-diazabicyclo[5.4.0]undec-7-ene), triethylamine and the like serveas silanol condensation catalysts.

The present inventors used guanidine compounds having an aryl groupbound to a nitrogen atom thereof, such as the aryl-substituted biguanidecompounds described in Patent Document 12, as silanol condensationcatalysts for reactive silyl group-containing organic polymers andencountered a problem that such compounds sometimes show no sufficientcatalytic activity. Further, when they used DBU(1,8-diazabicyclo[5.4.0]undec-7-ene), triethylamine and the likedescribed in Patent Document 13 as silanol condensation catalysts, aproblem arose, namely the cured product surface, when touched by thehand, stains the hand due to the movement of an amine compound-derivedliquid compound to the cured product surface, that is bleeding out.Another problem encountered by them is that sometimes any practicalcurability or adhesiveness cannot be secured.

Patent Document 1: Japanese Kokai Publication Sho-52-73998

Patent Document 2: Japanese Kokai Publication Sho-63-6041

Patent Document 3: Japanese Kokai Publication Hei-5-39428

Patent Document 4: Japanese Kokai Publication Hei-9-12860

Patent Document 5: Japanese Kokai Publication 2000-313814

Patent Document 6: Japanese Kokai Publication 2000-345054

Patent Document 7: Japanese Kokai Publication 2003-206410

Patent Document 8: Japanese Kokai Publication Hei-5-117519

Patent Document 9: Japanese Kokai Publication Hei-9-100408

Patent Document 10: Japanese Kokai Publication Hei-11-193343

Patent Document 11: Japanese Kokai Publication 2004-83805

Patent Document 12: Japanese Kokai Publication 2005-248175

Patent Document 13: International Publication WO2004/022618

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide acurable composition comprising a reactive silyl group-containing organicpolymer which allows slight bleedout of a liquid compound to occur tothe cured product surface and shows good curability and adhesivenessusing an amine compound as a silanol condensation catalyst without usingany highly toxic organotin catalyst.

The present inventors made intensive investigations to solve suchproblems and, as a result, found that when an amine compound having aspecific structure and a melting point not lower than 23° C. is used asa silanol condensation catalyst for reactive silyl group-containingorganic polymers, curable compositions which allows slight bleedout of aliquid compound to occur to the cured product surface and shows goodcurability and adhesiveness can be obtained in spite of its being anon-organotin catalyst. These findings have led to completion of thepresent invention.

Thus, the present invention relates to a non-organotin-based curablecomposition which comprises:

(A) an organic polymer having a silicon-containing group capable ofcrosslinking by siloxane bond formation,

(B) an amidine compound represented by the general formula (1):R¹N═CR²—NR³ ₂  (1)(wherein R¹ is a hydrogen atom or a substituted or unsubstitutedmonovalent hydrocarbon group whose α-carbon to the nitrogen atom hassingle bonds alone (has no unsaturated bond), R² is a hydrogen atom or asubstituted or unsubstituted monovalent hydrocarbon group and the two R³moieties each independently is a hydrogen atom or a monovalent organicgroup; any two or more of R¹, R² and the two R³ moieties may be boundtogether to form a ring structure) and having a melting point of notlower than 23° C. and/or a guanidine compound represented by the generalformula (2):R⁴N═C(NR⁵ ₂)—NR⁶ ₂  (2)(wherein R⁴, the two R⁵ moieties and the two R⁶ moieties eachindependently is a hydrogen atom or a non-aryl monovalent organic groupand any two or more of R⁴, the two R⁵ moieties and the two R⁶ moietiesmay be bound together to form a ring structure) and having a meltingpoint of not lower than 23° C.

In a preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the amidine compound is an amidine compound of the generalformula (1) wherein any two or more of R¹, R² and the two R³ moietiesare bound together to form a ring structure.

In a more preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the amidine compound of the general formula (1) is a cyclicamidine compound represented by the general formula (3):

(wherein R⁷ is a substituted or unsubstituted divalent hydrocarbon groupwhose α-carbon to each nitrogen atom has single bonds alone (has nounsaturated bond), R⁸ is a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group and R⁹ each independently isa hydrogen atom or a monovalent organic group and R⁸ and R⁹ may be boundtogether to form a ring structure.)

In a preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the guanidine compound represented by the general formula (2) isa biguanide compound represented by the general formula (4):R¹⁰N═C(NR¹¹ ₂)—NR¹²—C(═NR¹³)—NR¹⁴ ₂  (4)(wherein R¹⁰, the two R¹¹ moieties, R¹², R¹³ and the two R⁴ moietieseach independently is a hydrogen atom or a non-aryl monovalent organicgroup; any two or more of R¹⁰, the two R¹¹ moieties, R¹², R¹³ and thetwo R¹⁴ moieties may be bound together to form a ring structure) and/orthe general formula (5):R¹⁵N═C(NR¹⁶ ₂)—N═C(NR¹⁷ ₂)—NR¹⁸ ₂  (5)(wherein R¹⁵, the two R¹⁶ moieties, the two R¹⁷ moieties, and the twoR¹⁸ moieties each independently is a hydrogen atom or a non-arylmonovalent organic group; any two or more of R¹⁵, the two R¹⁶ moieties,the two R¹⁷ moieties and the two R¹⁸ moieties may be bound together toform a ring structure).

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the guanidine compound is a guanidine compound represented bythe general formula (2) wherein any two or more of R⁴, the two R⁵moieties and the two R⁶ moieties are bound together to form a ringstructure.

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the guanidine compound represented by the general formula (2) isa cyclic guanidine compound represented by the general formula (6):

(wherein R⁹ is a divalent organic group and the two R²⁰ moieties and R²¹each independently is a hydrogen atom or a non-aryl monovalent organicgroup; any two of the two R²⁰ moieties and R²¹ may be bound together toform a ring structure).

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the (A) component organic polymer comprises at least one polymerselected from the group consisting of polyoxyalkylene polymers,saturated hydrocarbon polymers and (meth)acrylate ester polymers.

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the polyoxyalkylene polymer is a polyoxypropylene polymer.

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

wherein the main chain skeleton of the polyoxyalkylene polymer iscomposed of hydrogen atoms, carbon atoms and oxygen atoms alone.

In a further preferred mode of embodiment, the invention relates to

the non-organotin-based curable composition defined above

which comprises the component (B) in a proportion of 0.001 to 20 partsby weight per 100 parts by weight of the component (A).

In a further preferred mode of embodiment, the invention relates to

the curable composition defined above

which further comprises an adhesion promoter (C) in a proportion of 0.01to 20 parts by weight per 100 parts by weight of the component (A).

A sealing composition or adhesive composition which comprises theabove-mentioned curable composition may be mentioned as a preferred useof the non-organotin-based curable composition according to theinvention.

DETAILED DESCRIPTION OF THE INVENTION

In the following, the present invention is described in detail.

The present invention relates to a non-organotin-based curablecomposition comprising a reactive silyl group-containing organic polymerand a specific silanol condensation catalyst. The term“non-organotin-based curable composition” as used herein refers to acurable composition comprising substantially no organotin compound.

The main chain skeleton of the reactive silyl group-containing organicpolymer (A) to be used in the practice of the invention is notparticularly restricted but may be any of various main chain skeletons.From the viewpoint of good compatibility with the component (B) and goodcurability and adhesiveness of the compositions obtained, however, theskeleton is preferably one containing hydrogen atoms and carbon atoms,optionally together with at least one hetero atom selected from amongnitrogen atoms, oxygen atoms and sulfur atoms.

In particular, there may be mentioned polyoxyalkylene polymers such aspolyoxyethylene, polyoxypropylene, polyoxybutylene,polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, andpolyoxypropylene-polyoxybutylene copolymer; hydrocarbon polymers such asethylene-propylene copolymer, polyisobutylene, isobutylene-isoprene andthe like copolymer, polychloroprene, polyisoprene, copolymer of isopreneor butadiene with acrylonitrile and/or styrene etc., polybutadiene,copolymer of isoprene or butadiene with acrylonitrile and styrene etc.,and hydrogenated polyolefin copolymers obtained by hydrogenation ofthese polyolefin polymers; polyester polymers such as condensationpolymers of dibasic acid such as adipic acid and glycol and ring-openingpolymers of lactones; (meth) acrylic ester polymers obtained by radicalpolymerization of monomers such as ethyl(meth)acrylate andbutyl(meth)acrylate etc.; vinyl polymers obtained by radicalpolymerization of monomers such as (meth) acrylic ester monomers, vinylacetate, acrylonitrile and styrene etc.; graft polymers obtained bypolymerization of vinyl monomers in the above-mentioned organicpolymers; polysulfide polymers; polyamide polymers such as nylon 6obtained by ring opening polymerization of ε-caprolactam, nylon 6,6obtained by condensation polymerization of hexamethylenediamine andadipic acid, nylon 6,10 obtained by condensation polymerization ofhexamethylenediamine and sebacic acid, nylon 11 obtained by condensationpolymerization of s-aminoundecanoic acid, nylon 12 obtained byring-opening polymerization of ε-aminolaurolactam, and copolymer nyloncomprising two or more components of the monomer components composingthe above-mentioned nylons; polycarbonates produced by condensationpolymerization of bisphenol A and carbonyl chloride etc.; diallylphthalate polymers; and the like.

Saturated hydrocarbon polymers such as polyisobutylene, hydrogenatedpolyisoprene, and hydrogenated polybutadiene, polyoxyalkylene polymers,and (meth) acrylic ester polymers are more preferable since they haverelatively low glass transition temperature and give cured productsexcellent in cold resistance.

The glass transition temperature of the organic polymer as the component(A) is not particularly limited, however it is preferably 20° C. orlower, more preferably 0° C. or lower, and further preferably −20° C. orlower. If the glass transition temperature exceeds 20° C., the viscosityis higher in winter and in a cold area and the workability may beworsened in some cases and the cured product may be deteriorated inflexibility and elongation in some cases. The glass transitiontemperature is a value measured by DSC measurement based on the JIS K7121.

Also, polyoxyalkylene polymers and (meth)acrylic ester polymers arepreferable since they have high moisture permeability and give excellentdeep part curability and adhesion in the case where they are used for aone package composition, polyoxyalkylene polymers are more preferable,and polyoxypropylene polymers are still more preferable. Thepolyoxyalkylene polymer is preferably one the main chain skeleton ofwhich is composed of hydrogen atoms, carbon atoms and oxygen atomsalone.

In accordance with the invention, a reactive silyl group-containingorganic polymer is used as the component (A) As compared with inorganicpolymers whose main chain skeleton comprises polydimethylsiloxane or thelike, the component (A), which is a constituent to be used in thepractice of the invention, is better in compatibility with the component(B) and the curable composition obtained is excellent in curability andadhesiveness.

In the present invention, the reactive silicon group to be contained inthe organic polymer is a group having a hydroxyl or hydrolysable groupbonded to a silicon atom and capable of crosslinking by siloxane bondformation by reaction accelerated by a silanol condensation catalyst.The reactive silicon group may include a group represented by thegeneral formula (7):—SiR²² _(3-a)X_(a)  (7)(wherein R²² independently represents an alkyl group having 1 to 20carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkylgroup having 7 to 20 carbon atoms, or a triorganosiloxy group defined as—OSi(R′)₃ (respective substituents R′ are independently a substituted orunsubstituted hydrocarbon group having 1 to 20 carbon atoms); respectivesubstituents X independently represent a hydroxyl or hydrolysable group;a denotes an integer of 1 to 3).

The hydrolysable group is not particularly limited and may include anyconventionally known hydrolysable group. In particular, examples includea hydrogen atom, a halogen atom, an alkoxy, acyloxy, ketoxymate, amino,amido, acid amido, aminoxy, mercapto, alkenyloxy, and the like groups.Among them, a hydrogen atom, an alkoxy, acyloxy, keoxymate, amino,amido, aminoxy, mercapto, and alkenyloxy groups are preferable and interms of moderate hydrolysability and handling easiness, an alkoxy groupis particularly preferable.

One to three hydrolysable groups and hydroxyl groups may be bonded toone silicon atom. In the case where two or more hydrolysable groups andhydroxyl groups are bonded in the reactive silicon group, they may besame or different.

The character a in the above-mentioned general formula (7) denotespreferably 2 or 3, and more preferably 3, in terms of curability.

Specific examples of R²² in the above-mentioned general formula (7) arealkyl groups such as methyl group and ethyl group; cycloalkyl groupssuch as cyclohexyl group; aryl groups such as phenyl group; aralkylgroups such as benzyl group; and triorganosiloxy groups defined as—OSi(R′)₃. Among them, methyl group is particularly preferable.

Specific examples of the reactive silicon group include trimethoxysilylgroup, triethoxysilyl group, triisopropoxysilyl group,dimethoxymethylsilyl group, diethoxymethylsilyl group, anddiisopropoxymethylsilyl group.

Since high activity and good curability can be obtained, trimethoxysilylgroup, triethoxysilyl group, and dimethoxymethylsilyl group are morepreferable and trimethoxysilyl group is even more preferable. From aviewpoint of storage stability, dimethoxymethylsilyl group isparticularly preferable. Triethoxysilyl group and diethoxymethylsilylgroup are particularly preferable since the alcohol to be produced byhydrolysis of the reactive silicon group is ethanol and thus it is moresafe.

Introduction of the reactive silicon group may be carried out by aconventionally known method. That is, the following methods may beemployed.

(A) An organic polymer having an unsaturated group is obtained bycausing reaction of an organic polymer having a functional group such asa hydroxyl group in a molecule with an organic compound having an activegroup reactive on the functional group and an unsaturated group.Alternatively, the organic polymer having an unsaturated group isobtained by copolymerization with an unsaturated group-containing epoxycompound. Successively, hydrosilylation is carried out by causingreaction of a reactive silicon group-containing hydrosilane on theobtained reaction product.

(B) A compound having a mercapto group and a reactive silicon group isreacted with the organic polymer having an unsaturated group obtained inthe same manner as the method (A).

(C) An organic polymer having a functional group such as a hydroxylgroup, an epoxy group, and an isocyanate group in a molecule is reactedwith a compound having a functional group reactive on the functionalgroup and a reactive silicon group.

The method described as the method (A) and the method of causingreaction of a polymer having a terminal hydroxyl group and a compoundhaving an isocyanate group and a reactive silicon group in the method(C) are preferable among the above-exemplified methods since they aresuitable of achieving high conversion efficiency in a relatively shortreaction time. The organic polymer having a reactive silicon groupobtained by the method (A) can give a curable composition with lowerviscosity and better workability than the organic polymer obtained bythe method (C) and the organic polymer obtained by the method (B) hasstrong odor due to the mercaptosilane and accordingly, the method (A) isparticularly preferable.

Specific examples of the hydroxysilane compound to be used in the method(A) include halogenated silanes such as trichlorosilane,methyldichlorosilane, dimethylchlorosilane, and phenyldichlorosilane;alkoxysilanes such as trimethoxysilane, triethoxysilane,methyldiethoxysilane, methyldimethoxysilane, phenyldimethoxysilane and1-[2-(trimethoxysilyl)ethyl]-1,1,3,3-tetramethyldisiloxane;acyloxysialnes such as methyldiacetoxysilane and phenyldiacetoxysilane;ketoximatosilanes such as bis(dimethylketoximato)methylsilane andbis(cyclohexylketoximato)methylsilane; and the like, but the examplesthereof are not limited to them. Among them, halogenated silanes andalkoxysilanes are preferable and alkoxysilanes are particularlypreferable since the curable composition to be obtained has moderatehydrolysability and is easy to handle. Among the alkoxysilanes,methyldimethylsilane is preferable since it is easily available and thecurable composition comprising the organic polymer to be obtainedtherefrom is excellent in the curability, storage stability, elongationproperty, and tensile strength. Trimethoxysilane is particularlypreferable in terms of good curability and recovery of the curablecomposition to be obtained therefrom.

As the synthesis method (B), there may be mentioned, for example, amethod of introducing a compound having a mercapto group and a reactivesilicon group into an unsaturated bond site of an organic compound byradical addition reaction in the presence of a radical initiator and/ora radical generation source, however it is not particularly limited.Specific examples of the compound having a mercapto group and a reactivesilicon group include γ-mercaptopropyltrimethoxysilane,γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltriethoxysilane,γ-mercaptopropylmethyldiethoxysilane, mercaptomethyltrimethoxysilane,mercaptomethyltriethoxysilane and the like, but are not limited to them.

A method for causing reaction of a polymer having a terminal hydroxylgroup and a compound having an isocyanate group and a reactive silicongroup as the synthesis method (C) may be, for example, the methoddisclosed in the Japanese Kokai Publication Hei-3-47825, however themethod is not particularly limited. Specific examples of the compoundhaving an isocyanate group and a reactive silicon group includeγ-isocyanatopropyltrimethoxysilane,γ-isocyanatopropylmethyldimethoxysilane,γ-isocyanatopropyltriethoxysilane,γ-isocyanatopropylmethyldiethoxysilane,isocyanatomethyltrimethoxysilane, isocyanatomethyltriethoxysilane,isocyanatomethyldimethoxymethylsilane,isocyanatomethyldiethoxymethylsilane and the like, but are not limitedto them.

In the case of using a silane compound such as trimethoxysilane havingthree hydrolysable groups bonded to one silicon atom, disproportionationreaction is sometimes promoted. If the disproportionation reaction ispromoted, an unstable compound such as dimethoxysilane is generatedwhich is difficult to be managed. However in the case of usingγ-mercaptopropyltrimethoxysilane or γ-isocyanatopropyltrimethoxysilane,such disproportionation reaction is not promoted. Therefore, thesynthesis method (B) or (C) is preferably employed in the case where agroup such as trimethoxysilyl having three hydrolysable groups bonded toone silicon atom is used as the silicon-containing group.

On the other hand, silane compounds represented by the general formula(8):H—(SiR²³ ₂O)_(m)SiR²³ ₂—R²⁴—SiX₃  (8)(wherein X is as defined above, the (2 m+2) R²³ moieties eachindependently is a monovalent hydrocarbon group, preferably, from theavailability and cost viewpoint, a monovalent hydrocarbon groupcontaining 1 to 20 carbon atoms, more preferably a monovalenthydrocarbon group containing 1 to 8 carbon atoms, particularlypreferably a monovalent hydrocarbon group containing 1 to 4 carbonatoms, R²⁴ is a divalent organic group, preferably, from theavailability and cost viewpoint, a divalent hydrocarbon group containing1 to 12 carbon atoms, more preferably a divalent hydrocarbon groupcontaining 2 to 8 carbon atoms, particularly preferably a divalenthydrocarbon group containing 2 carbon atoms, and m is an integer of 0 to19, preferably, from the availability and cost viewpoint, 1), do notundergo the disproportionation reaction. Therefore, in cases where agroup consisting of a silicon atom and three hydrolysable groups boundthereto is to be introduced by the synthesizing method (A), the use of asilane compound represented by the general formula (8) is preferred. Asspecific examples of the silane compound represented by the generalformula (8), there may be mentioned1-[2-(trimethoxysilyl)ethyl]-1,1,3,3-tetramethyldisiloxane,1-[2-(trimethoxysilyl)propyl]-1,1,3,3-tetramethyldisiloxane and1-[2-(trimethoxysilyl)hexyl]-1,1,3,3-tetramethyldisiloxane.

The reactive silicon group-containing organic polymer may have a linearor branched structure and the polymer has a number average molecularweight on the basis of conversion into polystyrene by GPC in a rangefrom 500 to 100,000, more preferably in a range from 1,000 to 50,000,and further preferably in a range from 3,000 to 30,000. If the numberaverage molecular weight is lower than 500, the cured product tends tobe undesirable in terms of the elongation property of the cured productand if it exceeds 100,000, the workability tends to become undesirablebecause of high viscosity. The procedure for determining the numberaverage molecular weight is not particularly restricted, but themolecular weight can be measured as values on the polystyrene equivalentbasis using, for example, the following:

Pumping system: Tosoh HLC-8120 GPC;

Column: Tosoh TSK-GEL H type;

Solvent: THF.

To obtain a rubber-like cured product with high strength, highelongation and low modulus of elasticity, the number of reactive silicongroups contained per one molecule of the organic polymer is at least oneand more preferably 1.1 to 5 on average. If the number of reactivesilicon groups contained in a molecule on average is lower than 1, thecurability becomes insufficient and it becomes difficult to obtain goodrubber elastic behavior. The reactive silicon group may be at either aterminus of the main chain or a terminus of a side chain of the organicpolymer molecular chain or both. Particularly, in the case where thereactive silicon group exists only at a terminus of the main chain ofthe molecular chain, the effective mesh length of the organic polymercomponent contained in the cured product to be obtained finally islengthened and it makes easy to obtain the rubber-like cured producthaving high strength, high elongation, and low modulus of elasticity.

The above-mentioned polyoxyalkylene polymer is substantially a polymercontaining of a repeating unit represented by the general formula (9):—R²⁵—O—  (9)(wherein R²⁵ represents a linear or branched alkylene group having 1 to14 carbon atoms) and R²⁵ in the general formula (9) is a linear orbranched alkylene group having preferably 1 to 14-carbon atoms and morepreferably 2 to 4-carbon atoms. Further, in cases where theabove-mentioned repeating unit of the polymer is an alkylene groupcomposed of carbon atoms and hydrogen atoms alone, the polymer obtained,when used in a sealant composition, for instance, shows betteradhesiveness as compared with the case of a fluorinated alkylene group,hence such alkylene group is more preferred. Specific examples of therepeating unit represented by the general formula (9) are as follows;—CH₂O—, —CH₂CH₂O—, —CH₂CH(CH₃) O—, —CH₂CH(CH₂CH₅) O—, —CH₂C(CH₃)₂O—,—CH₂CH₂CH₂CH₂O—, and the like. The main chain skeleton of thepolyoxyalkylene polymer may contain only one kind of repeating unit ortwo or more kinds of repeating units. Particularly, in the case of usingit for a sealant etc., a polymer containing a propylene oxide polymer asa main component is preferable since it is amorphous and has arelatively low viscosity.

A synthesis method of the polyoxyalkylene polymer may include, forexample, a polymerization method using an alkaline catalyst such as KOH,a polymerization method using a transition metal compound-porphyrincomplex catalyst obtained by causing reaction of an organic aluminumcompound and porphyrin as described in Japanese Kokai PublicationSho-61-215623, a polymerization method using a composite metal cyanidecomplex catalyst disclosed in Japanese Kokoku Publication Sho-46-27250,Japanese Kokoku Publication Sho-59-15336, U.S. Pat. No. 3,278,457, U.S.Pat. No. 3,278,458, U.S. Pat. No. 3,278,459, U.S. Pat. No. 3,427,256,U.S. Pat. No. 3,427,334, and U.S. Pat. No. 3,427,335 etc., apolymerization method using a catalyst containing a polyphosphazene saltexemplified in Japanese Kokai Publication Hei-10-273512, and apolymerization method using a catalyst containing a phosphazene compoundexemplified in Japanese Kokai Publication Hei-11-060722, however it isnot limited to these examples.

A production method of a polyoxyalkylene polymer having a reactivesilicon group may include those proposed in Japanese Kokoku PublicationSho-45-36319, Japanese Kokoku Publication Sho-46-12154, Japanese KokaiPublication Sho-50-156599, Japanese Kokai Publication Sho-54-6096,Japanese Kokai Publication sho-55-13767, Japanese Kokai PublicationSho-55-13468, Japanese Kokai Publication Sho-57-164123, Japanese KokokuPublication Hei-3-2450, U.S. Pat. No. 3,632,557, U.S. Pat. No.4,345,053, U.S. Pat. No. 4,366,307, and U.S. Pat. No. 4,960,844 etc.,and also polyoxyalkylene polymers having a number average molecularweight of 6,000 or higher and a Mw/Mn ratio (weight average molecularweight/number average molecular weight) of 1.6 or lower and thus havinghigh molecular weight and narrow molecular weight distribution asdescribed in Japanese Kokai Publication Sho-61-197631, Japanese KokaiPublication Sho-61-215622, Japanese Kokai Publication Sho-61-215623,Japanese Kokai Publication Sho-61-218632, Japanese Kokai PublicationHei-3-72527, Japanese Kokai Publication Hei-3-47825, and Japanese KokaiPublication Hei-8-231707 can be exemplified, but not limited to theseexamples.

The above-mentioned polyoxyalkylene polymers having a reactive silicongroup may be used each alone or two or more of them may be used incombination.

The above-mentioned saturated hydrocarbon polymer is a polymersubstantially having no unsaturated carbon-carbon bond other thanaromatic ring and the polymer forming its skeleton may be obtained by(1) polymerizing, as a main monomer, an olefin compound having 2 to 6carbon atoms such as ethylene, propylene, 1-butene, and isobutylene or(2) homopolymerizing a diene compound such as butadiene and isopreneand/or copolymerizing the above-mentioned olefin compound andsuccessively hydrogenating the homopolymer or copolymer. An isobutylenepolymer and a hydrogenated polybutadiene polymer are preferable sincethey are easy to be introduced with a functional group into a terminusthereof and be controlled in the molecular weight, and they havepossibility to have a large number of terminal functional groups, and anisobutylene polymer is particularly preferable. Further, that theabove-mentioned olefin compound or diene compound is a compoundconsisting of carbon atoms and hydrogen atoms alone is more preferredsince the polymer obtained, when used in a sealant composition, forinstance, shows better adhesiveness as compared with the case of afluorinated olefin compound or fluorinated diene compound.

Those having a saturated hydrocarbon polymer as a main skeleton areexcellent in heat resistance, weather resistance, durability andmoisture-shutting property.

The isobutylene polymer may consist of solely isobutylene unit for allmonomer units and may be a copolymer of isobutylene unit and anothermonomer, however in terms of the rubber property, the polymer ispreferable to consist of 50% by weight or more, more preferable toconsist of 80% by weight or more, and further preferable to consist of90 to 99% by weight, of a repeating unit derived from isobutylene.

Various kinds of polymerization methods have been reported so far as asynthesis method of the saturated hydrocarbon polymer and particularlyin recent years, so-called living polymerization has been developed. Inthe case of the saturated hydrocarbon polymer, particularly theisobutylene polymer, it is known that the polymer is easy to be producedby employing inifer polymerization (J. P. Kennedy et al., J. PolymerSci., Polymer Chem. Ed. vol. 15, p. 2843 (1997)) discovered by Kennedyet al.; that polymerization can be carried out to give a molecularweight in a range from 500 to 100,000 with molecular weight distributionof 1.5 or narrower; and that various kinds of functional groups may beintroduced into the molecule termini.

Examples of the production method of the saturated hydrocarbon polymerhaving a reactive silicon group may be, for example, the methodsdescribed in Japanese Kokoku Publication Hei-4-69659, Japanese KokokuPublication Hei-7-108928, Japanese Kokai Publication Sho-63-254149,Japanese Kokai Publication Sho-64-22904, Japanese Kokai PublicationHei-1-197509, Patent pamphlet No. 2,539,445 and Patent pamphlet No.2,873,395, and Japanese Kokai Publication Hei-7-53882, however themethod is not limited to these exemplified methods.

The above-mentioned saturated hydrocarbon polymer having a reactivesilicon group may be used alone or two or more kinds of the polymer maybe used in combination.

A (meth)acrylic ester monomer composing the main chain of theabove-mentioned (meth)acrylic ester polymer is not particularly limitedand various kinds of monomers may be used. Examples include(meth)acrylic acid monomers such as (meth)acrylic acid,methyl(meth)acrylate, ethyl (meth)acrylate, n-propyl(meth)acrylate,isopropyl (meth)acrylate, n-butyl(meth)acrylate, isobutyl(meth)acrylate, tert-butyl(meth)acrylate, n-pentyl (meth)acrylate,n-hexyl(meth)acrylate, cyclohexyl (meth)acrylate,n-heptyl(meth)acrylate, n-octyl (meth)acrylate,2-ethylhexyl(meth)acrylate, nonyl (meth)acrylate, decyl(meth)acrylate,dodecyl(meth)acrylate, phenyl(meth)acrylate, tolyl(meth)acrylate, benzyl(meth)acrylate, 2-methoxyethyl(meth)acrylate,3-methoxybutyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate,2-hydroxypropyl(meth)acrylate, stearyl(meth)acrylate,glycidyl(meth)acrylate, 2-aminoethyl(meth)acrylate,γ-(methacryloyloxypropyl)trimethoxysilane,γ-(methacryloyloxypropyl)dimethoxymethylsilane,methacryloyloxymethyltrimethoxysilane,methacryloyloxymethyltriethoxysilane,methacryloyloxymethyldimethoxymethylsilane,methacryloyloxymethyldiethoxymethylsilane, (meth)acrylic acid ethyleneoxide adduct and the like. With respect to the (meth) acrylic esterpolymer, the following vinyl monomers can be copolymerized together witha (meth) acrylic ester monomer. Examples of the vinyl monomer arestyrene monomers such as styrene, vinyltoluene, α-methylstyrene,chlorostyrene, styrenesulfonic acid and its salts; silicon-containingvinyl monomers such as vinyltrimethoxysilane and vinyltriethoxysilane;maleic anhydride, maleic acid, and monoalkyl and dialkyl esters ofmaleic acid; fumaric acid, and monoalkyl and dialkyl esters of fumaricacid; maleimide monomers such as maleimide, methylmaleimide,ethylmaleimide, propylmaleimide, butylmaleimide, hexylmaleimide,octylmaleimide, dodecylmaleimide, stearylmaleimide, phenylmaleimide, andcyclohexylmaleimide; nitrile group-containing vinyl monomers such asacrylonitrile and methacrylonitrile; amido group-containing vinylmonomers such as acrylamide and methacrylamide; vinyl esters such asvinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, andvinyl cinnamate; alkenes such as ethylene and propylene; conjugateddienes such as butadiene and isoprene; vinyl chloride, vinylidenechloride, ally chloride, and allyl alcohol; and the like. They may beused alone or a plurality of them may be copolymerized. Among them, interms of the physical properties of a produced material, and the like,polymers comprising a styrene monomer and a (meth)acrylic acid monomerare preferable. (Meth)acrylic polymers comprising an acrylic estermonomer and a methacrylic ester monomer are more preferable and acrylicpolymers comprising an acrylic ester monomer are further preferable. Inthe case of use for general construction and the like, since physicalproperties such as low viscosity of a mixture and low modulus, highelongation, weather resistance, and heat resistant of the cured product,and the like are required, a butyl acrylate monomer is more preferable.On the other hand, in the case of use for an automobile and the like forwhich oil-proofness etc. is required, an ethyl acrylate-based copolymeris more preferable. Since the polymer comprising mainly ethyl acrylatetends to be slightly inferior in low temperature properties (e.g. coldresistance) although having excellent oil-proofness, in order to improvethe low temperature properties, a portion of ethyl acrylate may bereplaced with butyl acrylate. However since the good oil-proofness islowered as the ratio of butyl acrylate is increased, the ratio ispreferably suppressed to 40 mol % or lower and more preferably to 30 mol% or lower for use requiring the oil-proofness. Also, to improve the lowtemperature properties and the like without deterioration of theoil-proofness, 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate and thelike in which oxygen is introduced in an alkyl group in the side chainis preferably used. However, since introduction of an alkoxy grouphaving an ether bond in the side chain tends to lower the heatresistance, the ratio is preferably adjusted to 40 mol % or lower whenheat resistance is needed. In accordance with the various uses andrequired aims, the required physical properties such as theoil-proofness, heat resistance, and low temperature properties should beconsidered and consequently, it is possible to adjust the ratio andobtain suitable polymers. For example, although it is not particularlylimited, ethyl acrylate/butyl acrylate/2-methoxyethyl acrylate copolymer[(40 to 50)/(20 to 30)/(30 to 20) ratio by mole] can be exemplified as apolymer with good balance of the physical properties such as theoil-proofness, heat resistance, and low temperature properties.

In this invention, these preferable monomers may be copolymerized withother monomers and also block-copolymerized with them and in that case,these preferable monomers are preferably contained at a ratio of 40% byweight or higher. In the above descriptions, (meth) acrylic acid meansacrylic acid and/or methacrylic acid.

A synthesis method of a (meth)acrylic ester polymer is not particularlylimited and a conventionally known method may be employed. However, apolymer obtained by a common free radical polymerization method using anazo compound, a peroxide or the like as a polymerization initiator has aproblem that the molecular weight distribution value is generally ashigh as 2 or higher and the viscosity is thus high. Accordingly, toobtain a (meth) acrylic ester polymer having a crosslinkable functionalgroup at a terminus of molecular chain at a high ratio, and with narrowmolecular weight distribution and low viscosity, a living radicalpolymerization method is preferably employed.

Among “living radical polymerization method”, “atom transfer radicalpolymerization method” for polymerizing a (meth)acrylic ester monomerusing an organic halide, a halogenated sulfonyl compound or the like asan initiator and a transition metal complex as a catalyst has, inaddition to the characteristics of the above-mentioned “living radicalpolymerization methods”, a wide range of the option of the initiator andthe catalyst since a halogen etc. which is relatively advantageous forthe functional group conversion reaction, and is therefore furtherpreferable as a production method of the (meth)acrylic ester polymerhaving a specified functional group. Examples of the atom transferradical polymerization method are, for example, the method described inMatyjaszewski et al., J. Am. Chem. Soc., vol. 117, p. 5614 (1995).

Examples of a production method of the (meth)acrylic ester polymerhaving a reactive silicon group are, for example, production methodsemploying free radical polymerization methods using chain transferagents and described in Japanese Kokoku Publication Hei-3-14068,Japanese Kokoku Publication Hei-4-55444, Japanese Kokai PublicationHei-6-211922, and the like. Also, a production method employing an atomtransfer radical polymerization method is disclosed in Japanese KokaiPublication Hei-9-272714 and the like, however the method is not limitedto these exemplified methods.

The above-mentioned (meth) acrylic ester polymers having a reactivesilicon group may be used alone or two or more kinds of them may be usedin combination.

These organic polymers having a reactive silicon group may be used aloneor two or more of them may be used in combination. Practically, organicpolymers obtained by blending two or more kinds of polymers selectedfrom the group consisting of polyoxyalkylene polymers having a reactivesilicon group, saturated hydrocarbon polymers having a reactive silicongroup, and (meth)acrylic ester polymers having a reactive silicon groupmay also be used.

Production methods of organic polymers by blending a polyoxyalkylenepolymer having a reactive silicon group and a (meth) acrylic esterpolymer having a reactive silicon group are proposed in Japanese KokaiPublication Sho-59-122541, Japanese Kokai Publication Sho-63-112642,Japanese Kokai Publication Hei-6-172631, Japanese Kokai PublicationHei-11-16763 and the like, however the production method is not limitedto these exemplified methods. A preferred specific example is aproduction method involving blending a polyoxyalkylene polymer having areactive silicon group with a copolymer having a reactive silicon groupand a molecular chain substantially comprising a (meth) acrylic estermonomer unit having an alkyl group of 1 to 8 carbon atoms andrepresented by the following general formula (10):—CH₂—C(R²⁶)(COOR²⁷)—  (10)(wherein R²⁶ represents a hydrogen atom or a methyl group; and R²⁷denotes an alkyl group having 1 to 8 carbon atoms) and a (meth)acrylicester monomer unit having an alkyl group of 10 or more carbon atoms andrepresented by the following general formula (11):—CH₂—C(R²⁶)(COOR²⁸)—  (11)(wherein R²⁶ represents the same as defined above; and R²⁸ denotes analkyl group having 10 or more carbon atoms).

Examples of R²⁷ in the above-mentioned formula (10) are alkyl groupshaving 1 to 8, preferably 1 to 4, and more preferably 1 or 2 carbonatoms such as methyl group, ethyl group, propyl group, n-butyl group,tert-butyl group, 2-ethylhexyl group and the like. Only one singlespecies of the alkyl group R²⁷ may be contained in the whole compositionor two or more different groups may be contained therein.

Examples of R²⁸ in the above-mentioned formula (11) are long chain alkylgroups having 10 or more, generally 10 to 30, and preferably 10 to 20carbon atoms such as lauryl group, tridecyl group, cetyl group, stearylgroup, behenyl group and the like. Same as the case of R²⁷, only onesingle species of the alkyl group R²⁸ may be contained in the wholecomposition or two or more different groups may be contained therein.

The molecular chain of the (meth)acrylic ester polymer substantiallycomprises the monomer units represented by the general formulae (10) and(11) and “substantially” here means the weight of the total of themonomer units represented by the general formulae (10) and (11)contained in the copolymer exceeds 50% by weight relative to the sum ofthe weight of the polymer. The total of the monomer units represented bythe general formulae (10) and (11) is preferably 70% by weight or more.

The ratio of the monomer unit represented by the general formula (10)and the monomer unit represented by the general formula (11) ispreferably from (95:5) to (40:60) and more preferably (90:10) to (60:40)on the basis of weight.

The monomer units which may be contained in the copolymer, other thanthose represented by the general formulae (10) and (11), may includeacrylic acid such as acrylic acid and methacrylic acid; amidogroup-containing monomers such as acrylamide, methacrylamide,N-methylolacrylamide, and N-methylolmethacrylamide, epoxygroup-containing monomers such as glycidyl acrylate and glycidylmethacrylate, and amino group-containing monomers such asdiethylaminoethyl acrylate, diethylaminoethyl methacrylate, andaminoethyl vinyl ether; and monomer units derived from acrylonitrile,styrene, α-methylstyrene, alkyl vinyl ether, vinyl chloride, vinylacetate, vinyl propionate, and ethylene.

The organic polymer obtained by blending the saturated hydrocarbonpolymer having a reactive silicon group and the (meth) acrylic estercopolymer having a reactive silicon group may include those proposed inJapanese Kokai Publication Hei-1-168764, Japanese Kokai Publication2000-186176 and the like, however it is not limited to these exemplifiedpolymers.

Further, a production method of the organic polymer obtained by blendingthe (meth) acrylic ester copolymer having a reactive silicon functionalgroup may also include a method of polymerizing a (meth) acrylic estermonomer in the presence of an organic polymer having a reactive silicongroup. The methods are practically disclosed in Japanese KokaiPublication Sho-59-78223, Japanese Kokai Publication Sho-59-168014,Japanese Kokai Publication Sho-60-228516, Japanese Kokai PublicationSho-60-228517 and the like, however the method is not particularlylimited to these exemplified methods.

On the other hand, the main chain skeleton of the organic polymer maycontain another component such as an urethane bond component in anextent that the effect of the invention is not so significantlyadversely affected.

The above-mentioned urethane bond component is not particularly limitedand may include a group (hereinafter, referred to as an amido segment insome cases) produced by reaction of an isocyanate group and an activehydrogen group.

The amido segment is a group represented by the general formula (12):—NR²⁹—C(═O)—  (12)(wherein R²⁹ denotes a hydrogen atom or a substituted or unsubstitutedmonovalent organic group).

The above-mentioned amido segment may specifically include an urethanegroup produced by reaction of an isocyanate group and a hydroxyl group;an urea group produced by reaction of an isocyanate group and an aminogroup; a thiourethane group produced by reaction of an isocyanate groupand a mercapto group; and the like. Also, in the invention, groupsproduced by reaction of an active hydrogen in the above-mentionedurethane group, urea group, and thiourea group further with anisocyanate group are also included as the group represented by thegeneral formula (12).

An industrial method for easily producing the organic polymer having theamido segment and a reactive silicon group may include, for example, amethod for producing the organic polymer by causing reaction of anexcess amount of a polyisocyanate compound with an organic polymerhaving an active hydrogen-containing group at a terminus for obtaining apolymer having an isocyanate group at the terminus of a polyurethanetype main chain and either successively or simultaneously causingreaction of the W-group of a silicon compound represented by the generalformula (13) with all or a portion of the isocyanate group:W—R³⁰—SiR²² _(3-a)X_(a)  (13)(wherein R²², X, and a are the same as described above; R³⁰ denotes adivalent organic group and more preferably a substituted orunsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms; Wdenotes an active hydrogen-containing group selected from a hydroxyl,carboxyl, mercapto, and (primary or secondary) amino groups).Conventionally known production methods of the organic polymer relevantto the above-mentioned production method are exemplified in JapaneseKokoku Publication Sho-46-12154 (U.S. Pat. No. 3,632,557), JapaneseKokai Publication Sho-58-109529 (U.S. Pat. No. 4,374,237), JapaneseKokai Publication Sho-62-13430 (U.S. Pat. No. 4,645,816), Japanese KokaiPublication Hei-8-53528 (EPO Patent No. 0676403), Japanese KokaiPublication Hei-10-204144 (EPO Patent No. 0831108), Japanese KohyoPublication 2003-508561 (U.S. Pat. No. 6,197,912), Japanese KokaiPublication Hei-6-211879 (U.S. Pat. No. 5,364,955), Japanese KokaiPublication Hei-10-53637 (U.S. Pat. No. 5,756,751), Japanese KokaiPublication Hei-11-100427, Japanese Kokai Publication 2000-169544,Japanese Kokai Publication 2000-169545, Japanese Kokai Publication2002-212415, Japanese Patent No. 3,313,360, U.S. Pat. No. 4,067,844,U.S. Pat. No. 3,711,445, Japanese Kokai Publication 2001-323040, and thelike.

The divalent organic group represented by R³⁰ is not particularlyrestricted but may be a saturated or unsaturated divalent hydrocarbongroup consisting of a hydrogen atom and a carbon atom or a divalenthydrocarbon having a substituent containing at least one hetero atomselected from among a nitrogen atom, an oxygen atom, a phosphorus atomand a sulfur atom.

Also, the method may include a method for producing the organic polymerby causing reaction of a reactive silicon group-containing isocyanatecompound represented by the general formula (14) with an organic polymerhaving an active hydrogen-containing group at a terminus:O═C═N—R³⁰—SiR²² _(3-a)X_(a)  (14)(wherein R²², R³⁰, X, and a are the same as described above).Conventionally known production methods of the organic polymer relevantto the above-mentioned production method are exemplified in JapaneseKokai Publication Hei-11-279249 (U.S. Pat. No. 5,990,257), JapaneseKokai Publication 2000-119365 (U.S. Pat. No. 6,046,270), Japanese KokaiPublication Sho-58-29818 (U.S. Pat. No. 4,345,053), Japanese KokaiPublication Hei-3-47825 (U.S. Pat. No. 5,068,304), Japanese KokaiPublication Hei-11-60724, Japanese Kokai Publication 2002-155145,Japanese Kokai Publication 2002-249538, Wo 03/018658, WO 03/059981, andthe like.

The organic polymer having an active hydrogen-containing group at aterminus may include oxyalkylene polymers having a hydroxyl group at aterminus (e.g. polyether polyols), polyacrylic polyols, polyesterpolyols, saturated hydrocarbon polymers having a hydroxyl group at aterminus (e.g. polyolefin polyols), polythiols compounds, polyaminecompounds and the like. Among them, polyether polyols, polyacrylicpolyols, and polyolefin polyols are preferable since the glasstransition temperature of the organic polymers to be obtained isrelatively low and cured products to be obtained are excellent in coldresistance. Particularly, polyether polyols are more preferable sincethe organic polymers to be obtained have low viscosity, good workabilityand excellent deep part curability and adhesion. Polyacrylic polyols andsaturated hydrocarbon polymers are further preferable since curedproducts derived from the organic polymers to be obtained are excellentin weather resistance and heat resistance.

The polyether polyols to be used may be those which are produced by anyproduction method, however the polyether polyols preferably have atleast 0.7 hydroxyl groups per molecular terminus on average of allmolecules. Practically, oxyalkylene polymers produced by using aconventional alkali metal catalyst; and oxyalkylene polymers produced bycausing reaction of alkylene oxides with an initiator such aspolyhydroxy compounds having at least two hydroxyl groups in thepresence of a composite metal-cyanide complex or cesium can beexemplified, for example.

Among the above-mentioned polymerization methods, the polymerizationmethod using a composite metal-cyanide complex is preferable sinceoxyalkylene polymers with low un-saturation degree, narrow Mw/Mn (weightaverage molecular weight/number average molecular weight), lowviscosity, high acid resistance, and high weather resistance can beobtained.

Examples of the above-mentioned polyacrylic polyols are polyols having a(meth) acrylic acid alkyl ester (co)polymer as a skeleton and containinga hydroxyl group in a molecule. A synthesis method of the polymers ispreferably a living radical polymerization method and more preferably anatom transfer radical polymerization method since they give narrowmolecular weight distribution and low viscosity. Also, a polymerobtained by so-called SGO process, that is a polymer obtained bycontinuous bulk polymerization of an acrylic alkyl ester monomer at hightemperature and high pressure as described in Japanese Kokai Publication2001-207157 is preferably used. More practically, UH-2000 manufacturedby Toagosei Co., Ltd. can be exemplified, for example.

Specific examples of the above-mentioned polyisocyanate compound mayinclude aromatic polyisocyanates such as toluene (tolylene)diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate;aliphatic polyisocyanates such as isophorone diisocyanate andhexamethylene diisocyanate; and the like.

The silicon compound represented by the general formula (13) is notparticularly limited and specific examples thereof are aminogroup-containing silanes such as γ-aminopropyltrimethoxysilane,N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane,γ-(N-phenyl)aminopropyltrimethoxysilane,N-ethylaminoisobutyltrimethoxysilane,N-cyclohexylaminomethyltriethoxysilane,N-cyclohexylaminomethyldiethoxymethylsilane, andN-phenylaminomethyltrimethoxysilane; hydroxy group-containing silanessuch as γ-hydroxypropyltrimethoxysilane; mercapto group-containingsilanes such as γ-mercaptopropyltrimethoxysilane; and the like. Also, asdescribed in Japanese Kokai Publication Hei-6-211879 (U.S. Pat. No.5,364,956), Japanese Kokai Publication Hei-10-53637 (U.S. Pat. No.5,756,751), Japanese Kokai Publication Hei-10-204144 (EPO Patent No.0831108), Japanese Kokai Publication 2000-169544, and Japanese KokaiPublication 2000-169545, Michael adducts of various kinds ofα,β-unsaturated carbonyl compounds and primary amino group-containingsilanes or Michael adducts of various kinds of (meth)acryloylgroup-containing silanes and primary amino group-containing compoundsare usable as the silicon compound represented by the general formula(13).

The reactive silicon group-containing isocyanate compound represented bythe general formula (14) is not particularly limited and specificexamples thereof are γ-trimethoxysilylpropyl isocyanate,γ-triethoxysilylpropyl isocyanate, γ-methyldimethoxysilylpropylisocyanate, γ-methyldiethoxysilylpropyl isocyanate,trimethoxysilylmethyl isocyanate, triethoxymethylsilylmethyl isocyanate,dimethoxymethylsilylmethyl isocyanate, diethoxymethylsilylmethylisocyanate and the like. Also, as described in Japanese KokaiPublication 2000-119365 (U.S. Pat. No. 6,046,270), compounds obtained byreaction of silicon compounds represented by the general formula (13)and excess amounts of the above-mentioned polyisocyanate compounds areusable as the reactive silicon group-containing isocyanate compoundrepresented by the general formula (14).

In the present invention, an amidine compound represented by the generalformula (1) and having a melting point of not lower than 23° C. and/or aguanidine compound represented by the general formula (2) and having amelting point of not lower than 23° C. are used as a silanolcondensation catalyst (B). (Hereinafter, the “amidine compound and/orguanidine compound” is sometimes referred to as “amine compound (B)” forshort.) When the amine compound (B) placed under the conditions ofordinary pressure (0.1013 MPa) and 23° C. is macroscopically found to bea solid, the melting point of the amine compound (B) can be judged to benot lower than 23° C.R¹N═CR²—NR³ ₂  (1)(wherein R¹ is a hydrogen atom or a substituted or unsubstitutedmonovalent hydrocarbon group whose 1-carbon to the nitrogen atom hassingle bonds alone (has no unsaturated bond), R² is a hydrogen atom or asubstituted or unsubstituted monovalent hydrocarbon group and the two R³moieties each independently is a hydrogen atom or a monovalent organicgroup; any two or more of R¹, R² and the two R³ moieties may be boundtogether to form a ring structure)R⁴N═C(NR⁵ ₂)—NR⁶ ₂  (2)(wherein R⁴, the two R⁵ moieties and the two R⁶ moieties eachindependently is a hydrogen atom or a non-aryl monovalent organic groupand any two or more of R⁴, the two R⁵ moieties and the two R⁶ moietiesmay be bound together to form a ring structure)

These amine compounds (B) function as the so-called silanol condensationcatalyst which can cause siloxane bond formation from the hydroxylgroups or hydrolysable groups bound to silicon atoms contained in the(A) component organic polymer. While organotin compounds such asdibutyltin dilaurate and dibutyltin diacetylacetonate are used in theprior art as silanol condensation catalysts for the component (A),namely reactive silyl group-containing organic polymer, the use of theamine compound (B) according to the invention can give curablecompositions having practical curability in spite of its being anon-organotin catalyst. When an amine compound having a melting pointlower than 23° C., a liquid matter tends to bleed out onto the curedproduct surface and the adhesiveness also tends to be poor. On thecontrary, when the amine compound (B) is used in accordance with theinvention, curable compositions allowing no bleedout to occur andshowing good adhesiveness can be obtained. The liquid matter causingbleedout on the cured product surface presumably comprises a compound(s)derived from the amine compound(s) used.

For imparting good curability, it is essential that R¹ in the generalformula (1) be a hydrogen atom or a substituted or unsubstitutedmonovalent hydrocarbon group whose α-carbon to the nitrogen atom hassingle bonds alone (has no unsaturated bond). R¹ is not particularlyrestricted provided that the α-carbon to the nitrogen atom has singlebonds alone; thus, it may be a saturated or unsaturated monovalenthydrocarbon group composed of hydrogen atoms and carbon atoms or amonovalent hydrocarbon group having a substituent(s) containing at leastone hetero atom selected from among a nitrogen atom, an oxygen atom, aphosphorus atom and a sulfur atom. From the viewpoints of availabilityor curability, R¹ is preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 20 carbonatoms whose α-carbon to the nitrogen atom has single bonds alone, andmore preferably a substituted or unsubstituted monovalent hydrocarbongroup containing 1 to 10 carbon atoms whose α-carbon to the nitrogenatom has single bonds alone.

R² in the general formula (1) is a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group.

The hydrocarbon group is not particularly restricted; thus, it may be asaturated or unsaturated monovalent hydrocarbon group composed ofhydrogen atoms and carbon atoms or a monovalent hydrocarbon group havinga substituent(s) containing at least one hetero atom selected from amonga nitrogen atom, an oxygen atom, a phosphorus atom and a sulfur atom.From the viewpoints of availability or curability, R² is preferably ahydrogen atom or a substituted or unsubstituted monovalent hydrocarbongroup containing 1 to 20 carbon atoms, and more preferably a hydrogenatom or a substituted or unsubstituted monovalent hydrocarbon groupcontaining 1 to 10 carbon atoms.

In the general formula (1), the two R³ moieties each is a hydrogen atomor a monovalent organic group. In cases where R³ is a monovalent organicgroup, each organic group is not particularly restricted but may be asaturated or unsaturated monovalent hydrocarbon group consisting of ahydrogen atom and a carbon atom alone or a monovalent hydrocarbon grouphaving a substituent(s) containing at least one hetero atom selectedfrom among a nitrogen atom, an oxygen atom, a phosphorus atom and sulfuratoms. Further, R³ each may be a functional group such as an amino groupor imino group. From the availability and curability viewpoint, the twoR³ moieties each is preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 20 carbonatoms, more preferably a hydrogen atom or a substituted or unsubstitutedmonovalent hydrocarbon group containing 1 to 10 carbon atoms.

Since high activity and good curability can be obtained, preferred asthe amidine compound represented by the general formula (1) are thoseamidine compounds of general formula (1) wherein any two or more of R¹,R² and the two R³ moieties are bound together to form a ring structure,and particularly preferred are cyclic amidine compounds represented bythe general formula (3):

(wherein R⁷ is a substituted or unsubstituted divalent hydrocarbon groupwhose α-carbon to the nitrogen atom has single bonds alone (has nounsaturated bond), R⁸ is a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group, R⁹ each independently is ahydrogen atom or a monovalent organic group and R⁸ and R⁹ may be boundtogether to form a ring structure.)

From the viewpoints of availability and curability, R⁷ in the generalformula (3) is preferably a substituted or unsubstituted divalenthydrocarbon group containing 1 to 10 carbon atoms whose α-carbon to thenitrogen atom has single bonds alone (has no unsaturated bond), morepreferably a substituted or unsubstituted divalent hydrocarbon groupcontaining 1 to 5 carbon atoms whose α-carbon to the nitrogen atom hassingle bonds alone, and particularly preferably a substituted orunsubstituted divalent hydrocarbon group containing 2 or 3 carbon atomswhose α-carbon to the nitrogen atom has single bonds alone. From theviewpoints of availability and curability, R⁸ and R⁹ each is preferablya hydrogen atom or a substituted or unsubstituted monovalent hydrocarbongroup containing 1 to 20 carbon atoms, and more preferably a hydrogenatom or a substituted or unsubstituted monovalent hydrocarbon groupcontaining 1 to 10 carbon atoms.

In the general formula (2), R⁴, the two R⁵ moieties and the two R⁶moieties each independently is a hydrogen atom or a non-aryl monovalentorganic group. In cases where any of R⁴, the two R⁵ moieties and the twoR⁶ moieties in the general formula (2) is a monovalent organic group,each organic group is not particularly restricted but may be a saturatedor unsaturated monovalent hydrocarbon group consisting of a hydrogenatom and a carbon atom alone or a monovalent hydrocarbon group having asubstituent(s) containing at least one hetero atom selected from among anitrogen atom, an oxygen atom, a phosphorus atom and sulfur atoms.Further, R⁴, the two R⁵ moieties and the two R⁶ moieties each may be afunctional group such as an amino group or imino group. From theavailability and curability viewpoint, R⁴, the two R⁵ moieties and thetwo R⁶ moieties each is preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 20 carbonatoms, and more preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 10 carbonatoms. Since, however, the curability decreases as the number of arylgroups increases, it is essential that R⁴, the two R⁵ moieties and thetwo R⁶ moieties each independently be a hydrogen atom or a non-arylmonovalent organic group.

From the adhesiveness and bleedout viewpoint, the guanidine compoundrepresented by the general formula (2) preferably comprises a biguanidecompound represented by the general formula (4) and/or a biguanidecompound represented by the general formula (5). The term “biguanidecompound” as used herein refers to a compound having the skeleton of thegeneral formula (4) or general formula (5).R¹⁰N═C(NR¹¹ ₂)—NR¹²—C(═NR¹³)—NR¹⁴ ₂  (4)(In the above formula, R¹⁰, the two R¹¹ moieties, R¹², R¹³ and the twoR¹⁴ moieties each independently is a hydrogen atom or a non-arylmonovalent organic group. Any two or more of R¹⁰, the two R¹¹ moieties,R¹², R¹³ and the two R¹⁴ moieties may be bound together to form a ringstructure.)R¹⁵N═C(NR¹⁶ ₂)—N═C(NR¹⁷ ₂)—NR¹⁸ ₂  (5)(In the above formula, R¹⁵, the two R¹⁶ moieties, the two R¹⁷ moietiesand the two R¹⁸ moieties each independently is a hydrogen atom or anon-aryl monovalent organic group. Any two or more of R¹⁵, the two R¹⁶moieties, the two R¹⁷ moieties and the two R¹⁸ moieties may be boundtogether to form a ring structure.)

From the availability, curability or adhesiveness viewpoint, R¹⁰, thetwo R¹¹ moieties, R¹², R¹³ and the two R¹⁴ moieties in the generalformula (4) each is preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 20 carbonatoms, and more preferably a hydrogen atom or a substituted orunsubstituted monovalent hydrocarbon group containing 1 to 10 carbonatoms. Since, however, the curability decreases as the number of arylgroups increases, it is essential that R¹⁰, the two R¹¹ moieties, R¹²,R¹³ and the two R¹⁴ moieties each independently be a hydrogen atom or anon-aryl monovalent organic group. From the curability or adhesivenessviewpoint, R¹⁵, the two R¹⁶ moieties, the two R¹⁷ moieties and the twoR¹⁸ moieties in the general formula (5) each is preferably a hydrogenatom or a substituted or unsubstituted monovalent hydrocarbon groupcontaining 1 to 20 carbon atoms, and more preferably a hydrogen atom ora substituted or unsubstituted monovalent hydrocarbon group containing 1to 10 carbon atoms. Since, however, the curability decreases as thenumber of aryl groups increases, it is essential that R¹⁵, the two R¹⁶moieties, the two R¹⁷ moieties and the two R¹⁸ moieties eachindependently be a hydrogen atom or a non-aryl monovalent organic group.

Since high activity and good curability can be obtained, preferred asthe guanidine compound represented by the general formula (2) are thoseguanidine compounds of general formula (2) wherein any two or more ofR⁴, the two R⁵ moieties and the two R⁶ moieties are bound together toform a ring structure, and particularly preferred are cyclic guanidinecompounds represented by the general formula (6):

(wherein R¹⁹ is a divalent organic group and the two R²⁰ moieties andR²¹ each independently is a hydrogen atom or a monovalent organic groupand any two of the two R²⁰ moieties and R²¹ may be bound together toform a ring structure.)

From the viewpoints of availability and curability, R¹⁹ in the generalformula (6) is preferably a substituted or unsubstituted divalenthydrocarbon group containing 1 to 10 carbon atoms, more preferably asubstituted or unsubstituted divalent hydrocarbon group containing 1 to10 carbon atoms whose α-carbon to the nitrogen atom has single bondsalone (has no unsaturated bond), still more preferably a substituted orunsubstituted divalent hydrocarbon group containing 1 to 5 carbon atomswhose α-carbon to the nitrogen atom has single bonds alone, andparticularly preferably a substituted or unsubstituted divalenthydrocarbon group containing 2 or 3 carbon atoms whose α-carbon to thenitrogen atom has single bonds alone. From the viewpoints ofavailability and curability, the two R²⁰ moieties and R²¹ each ispreferably a hydrogen atom or a substituted or unsubstituted monovalenthydrocarbon group containing 1 to 20 carbon atoms, and more preferably ahydrogen atom or a substituted or unsubstituted monovalent hydrocarbongroup containing 1 to 10 carbon atoms. From the viewpoints ofavailability and curability, any two of the two R²⁰ moieties and R²¹preferably is bound together to form a ring structure.)

The above-mentioned amine compound (B), when it has a high meltingpoint, tends to hardly bleed out and, therefore, it is essential thatthe melting thereof be not lower than 23° C., preferably not lower than40° C., more preferably not lower than 60° C., still more preferably notlower than 80° C., particularly preferably not lower than 120° C.

In cases where the amine compound (B) contains a small number of carbonatoms (has a low molecular weight), the amine compound becomes readilyevaporable and, as a result, the workability and/or curability tends todeteriorate. Therefore, the amine compound (B) preferably contains 2 ormore, more preferably 4 or more, still more preferably 6 or more,particularly preferably 7 or more carbon atoms. It is not necessary tospecifically define any upper limit to the number of carbon atoms. As ageneral numerical value range, however, there may be mentioned an upperlimit not larger than 10,000. The amine compound preferably has amolecular weight of 60 or higher, more preferably 120 or higher, stillmore preferably 130 or higher, and particularly preferably 160 orhigher. It is not necessary to specifically define any upper limit tothe molecular weight. As a general numerical value range, however, theremay be mentioned an upper limit not higher than 100,000.

As specific examples of the amine compound (B), there may be mentionedsuch amidine compounds as 2-methyl-2-imidazoline, 2-ethyl-2-imidazoline,2-n-propyl-2-imidazoline, 2-isopropyl-2-imidazoline,2-n-octyl-2-imidazoline, 1-(1-aminoethyl)-2-octyl-2-imidazoline,2-n-undecyl-2-imidazoline, 4-ethyl-2-undecyl-2-imidazoline,2-cyclohexyl-2-imidazoline, 2-phenyl-2-imidazoline,2-benzyl-2-imidazoline and2-[(3,4-dichlorophenoxy)methyl]-2-imidazoline; such guanidine compoundsas 1-n-butylguanidine, 1-benzylguanidine, 1,3-dibenzylguanidine,1-benzyl-2,3-dimethylguanidine, 1-benzylaminoguanidine,1-(benzyloxy)guanidine, dicyandiamide, guanylthiourea,1,5,7-triazabicyclo[4.4.0]dec-5-ene,2,3,5,6-tetrahydro-3-phenyl-1H-imidazo[1,2-a]imidazole and1,2-diisopropyl-3-[bis(dimethylamino)methylene]guanidine; and suchbiguanide compounds as biguanide, 1-methylbiguanide, 1-n-butylbiguanide,1-(2-ethylhexyl)biguanide, 1-n-octadecylbiguanide,1,1-dimethylbiguanide, 1,1-diethylbiguanide, 1-cyclohexylbiguanide,1-allylbiguanide, 1-benzylbiguanide, 1-phenethylbiguanide,3-phenethylbiguanide, 1,5-ethylenebiguanide, 1-morpholinobiguanide,3-morpholinobiguanide, 1-(4-chlorobenzyloxy)biguanide,1-n-butyl-N²-ethylbiguanide, 1,1′-ethylenebisbiguanide,1-[3-(diethylamino)propyl]biguanide,1-[3-(dibutylamino)propyl]biguanide,1-(morpholinosulfonyl)benzylbiguanide, 1-(hydroxymethyl)biguanide,1-(2-hydroxyethyl)biguanide and5-[3-(2,4,5-trichlorophenoxy)propoxy]-1-isopropylbiguanide, amongothers. These amine compounds may be used singly or two or more of themmay be used in combination.

Among the amine compounds (B) mentioned above 2-n-undecyl-2-imidazoline,2-phenyl-2-imidazoline, 1,5,7-triazacyclo[4.4.0]dec-5-ene, biguanide,1-n-butylguanidine and 1-n-butylbiguanide are preferred from thecurability, adhesiveness and/or bleedout viewpoint, and1,5,7-triazabicyclo[4.4.0]dec-5-ene and 1-n-butylbiguanide are morepreferred.

The level of addition of the amine compound (B) is preferably about0.001 to 20 parts by weight, more preferably about 0.01 to 15 parts byweight, particularly preferably about 0.1 to 10 parts by weight, per 100parts by weight of the (A) component organic polymer. When the level ofaddition of the amine compound (B) is lower than 0.001 part by weight,any practical rate of curing can no longer be obtained in some instancesand it may sometimes become difficult for the curing reaction to proceedto a sufficient extent. Conversely, when the level of addition of theamine compound (B) exceeds 20 parts by weight, the pot life becomes tooshort and the workability tends to become deteriorated.

In the present invention, an organotin compound can be used incombination with the amine compound (B). As specific examples, there maybe mentioned dibutyltin dilaurate, dibutyltin maleate, dibutyltinphthalate, dibutyltin dioctanoate, dibutyltin bis(2-ethylhexanoate),dibutyltin bis(methyl maleate), dibutyltin bis(ethyl maleate),dibutyltin bis(butyl maleate), dibutyltin bis(octyl maleate), dibutyltinbis(tridecyl maleate), dibutyltin bis(benzyl maleate), dibutyltindiacetate, dioctyltin bis(ethyl maleate), dioctyltin bis(octyl maleate),dibutyltin dimethoxide, dibutyltin bis(nonylphenoxide), dibutenyltinoxide, dibutyltin oxide, dibutyltin bis(acetylacetonate), dibutyltinbis(ethyl acetoacetonate), dibutyltin oxide-silicate compound reactionproducts and dibutyltin oxide-phthalate ester reaction products, and thelike. The combined use of the amine compound (B), which constitutes theinvention, and the organotin compound is expected to enhance thecatalytic activity and bring about improvements in curability and depthcurability, among others. However, organotin compounds may increase,according to the level of addition thereof, the toxicity of theresulting curable composition, so that the level of addition oforganotin compounds in the curable composition of the invention shouldpreferably be as low as possible. The level of addition of organotincompounds is preferably lower than 0.5 parts by weight, more preferablylower than 0.1 parts by weight, and still more preferably lower than0.05 parts by weight, per 100 parts of the (A) component; substantialabsence thereof is particularly preferred. The term “non-organotin-basedcurable composition” as used herein means that the organotin compoundaddition level is not higher than 50% by weight of all constituentcompounds serving as silanol condensation catalysts. Such organotincompound addition level is preferably not higher than 30% by weight,more preferably not higher than 10% by weight, still more preferably nothigher than 1% by weight; substantial absence of any organotin compoundin the curable composition is particularly preferred.

Another silanol condensation catalyst (hereinafter, referred to as“metal compound” in some cases) may also be used in combination in anamount such that the effects of the of the amine compound (B), whichconstitutes the invention, will not be lessened. As specific examples,there may be mentioned carboxylic acid metal salts such as tincarboxylates, lead carboxylates, bismuth carboxylates, potassiumcarboxylates, calcium carboxylates, barium carboxylates, titaniumcarboxylates, zirconium carboxylates, hafnium carboxylates, vanadiumcarboxylates, manganese carboxylates, iron carboxylates, cobaltcarboxylates, nickel carboxylates and cerium carboxylates; such titaniumcompounds as tetrabutyl titanate, tetrapropyl titanate, titaniumtetrakis(acetylacetonate), bis(acetylacetonato)diisopropoxytitanium anddiisopropoxytitanium bis(ethyl acetoacetate); aluminum compounds such asaluminum tris(acetylacetonate), aluminum tris(ethyl acetoacetate) anddiisopropoxyaluminum ethyl acetoacetate; zirconium compounds such aszirconium tetrakis(acetylacetonate); various metal alkoxides such astetrabutoxyhafnium; organic acidic phosphate esters; organic sulfonicacids such as trifluoromethanesulfonic acid; and inorganic acids such ashydrochloric acid, phosphoric acid and boric acid. The combined use ofthese curing catalysts is expected to enhance the catalytic activity andbring about improvements in depth curability, thin layer curability andadhesiveness, among others. However, from the environmental stressviewpoint, the level of addition of metal compounds should alsopreferably be as low as possible. The level of addition of metalcompounds is preferably not higher than 10 parts by weight, morepreferably not higher than 5 parts by weight, per 100 parts by weight ofthe (A) component; substantial absence thereof is particularlypreferred.

The curable composition of the invention is a non-organotin-basedcurable composition and, more preferably from the toxicity and/orenvironmental stress viewpoint, it is a non-organotin-based curablecomposition substantially free of any organotin compound or such a tincompound as a tin carboxylate, still more preferably anon-organotin-based, metal carboxylate salt-free curable compositionsubstantially free of any organotin compound or any of various metalcarboxylate salts, particularly preferably a non-metal catalyst-basedcurable composition substantially free of any metal carboxylate salt,titanium compound, organotin compound, organoaluminum compound,zirconium compound or like metal element-containing curing catalyst.

A carboxylic acid may also be used in combination as a cocatalyst orpromoter in an amount not lessening the effects of the amine compound(B), which constitutes the invention. Specific examples of thesecarboxylic acids may include linear saturated fatty acids such as aceticacid, propionic acid, butyric acid, valeric acid, caproic acid, enanthicacid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid,undecanoic acid, lauric acid, tridecyl acid, myristic acid, pentadecylacid, palmitic acid, heptadecyl acid, stearic acid, nonadecanoic acid,arachic acid, behenic acid, lignoceric acid, cerotic acid, montanicacid, melissic acid, and lacceric acid; mono-ene unsaturated fatty acidssuch as undecylenic acid, linderic acid, tsuzuic acid, physeteric acid,myristoleic acid, 2-hexadecenic acid, 6-hexadecenic acid, 7-hexadecenicacid, palmitoleic acid, petroselinic acid, oleic acid, elaidic acid,asclepic acid, vaccenic acid, gadoleic acid, gondoic acid, cetoleicacid, erucic acid, brassylic acid, selacholeic acid, ximenic acid,rumenic acid, acrylic acid, methacrylic acid, angelic acid, crotonicacid, isocrotonic acid, and 10-undecenic acid; polyene unsaturated fattyacids such as linoelaidic acid, linoleic acid, 10,12-octadecadienicacid, hiragonic acid, α-eleostearic acid, β-eleostearic acid, punicicacid, linolenic acid, 8,11,14-eicosatrienoic acid,7,10,13-docosatrienoic acid, 4,8,11,14-hexadecatetraenoic acid, morocticacid, stearidonic acid, arachidonic acid, 8,12,16,19-docosatetraenoicacid, 4,8,12,15,18-eicosapentaenoic acid, clupanodonic acid, herringacid, and docosahexaenoic acid; branched fatty acids such as1-methylbutyric acid, isobutyric acid, 2-ethylbutyric acid, isovalericacid, tuberculostearic acid, pivalic acid, 2,2-dimethylbutyric acid,2-ethyl-2-methylbutyric acid, 2,2-diethylbutyric acid,2,2-dimethylvaleric acid, 2-ethyl-2-methylvaleric acid,2,2-diethylvaleric acid, 2,2-dimethylhexanoic acid, 2,2-diethylhexanoicacid, 2,2-dimethyloctanoic acid, 2-ethyl-2,5-dimethylhexanoic acid,neodecanoic acid, and versatic acid; triple bond-containing fatty acidssuch as propiolic acid, tariric acid, stearolic acid, crepenynic acid,ximenynic acid, and 7-hexadecinic acid; alicyclic carboxylic acids suchas naphthenic acid, malvalinic acid, sterculic acid, hydnocarpic acid,chaulmoogric acid, gorlic acid, 1-methylcyclopentanecarboxylic acid,1-methylcyclohexanecarboxylic acid,2-methylbicyclo[2.2.1]-5-heptene-2-carboxylic acid,1-adamantanecarboxylic acid, bicycle[2.2.1]heptane-1-carboxylic acid,and bicycle[2.2.2]octane-1-carboxylic acid; oxygen-containing fattyacids such as acetoacetic acid, ethoxyacetic acid, glyoxylic acid,glycolic acid, gluconic acid, sabinic acid, 2-hydroxytetradecanoic acid,ipurolic acid, 2,2-dimethyl-3-hydroxypropione acid,2-hydroxyhexadecanoic acid, jarapinolic acid, juniperinic acid,ambrettolic acid, aleuritic acid, 2-hydroxyoctadecanoic acid,12-hydroxyoctadecanoic acid, 18-hydroxyoctadecanoic cid,9,10-dihydroxyoctadecanoic acid, ricinoleic acid, kamlolenic acid,licanic acid, phellonic acid, cerebronic acid, and2-methyl-7-oxabicyclo[2.2.1]-5-heptene-2-carboxylic acid;halogen-substituted monocarboxylic acids such as chloroacetic acid,2-chloroacrylic acid, and chlorobenzoic acid; and the like. Examples ofthe aliphatic dicarboxylic acids include saturated dicarboxylic acidssuch as adipic acid, azelaic acid, pimelic acid, suberic acid, sebacicacid, ethylmalonic acid, glutaric acid, oxalic acid, malonic acid,succinic acid, oxydiacetic acid, dimethylmalonic acid,ethylmethylmalonic acid, diethylmalonic acid, 2,2-dimethylsuccinic acid,2,2-diethylsuccinic acid, 2,2-dimethylglutaric acid, and1,2,2-trimethyl-1,3-cyclopentanedicarboxylic acid; unsaturateddicarboxylic acids such as maleic acid, fumaric acid,acetylenedicarboxylic acid, and itaconic acid; and the like. Examples ofthe aliphatic polycarboxylic acid are tricarboxylic acids such asaconitic acid, 4,4-dimethylaconitic acid, citric acid, isocitric acid,and 3-methylisocitric acid; and the like. Examples of the aromaticcarboxylic acids are aromatic monocarboxylic acids such as benzoic acid,9-anthracenecarboxylic acid, atrolactinic acid, anisic acid,isopropylbenzoic acid, salicylic acid, and toluic acid; aromaticpolycarboxylic acids such as phthalic acid, isophthalic acid,terephthalic acid, carboxyphenylacetic acid, and pyromellitic acid; andthe like. The combined use of these curing catalysts is expected toenhance the catalytic activity and bring about improvements incurability and depth curability, among others. The addition level of thecarboxylic acid is preferably 0.01 to 20 parts by weight, and morepreferably 0.1 to 10 parts by weight, per 100 parts by weight of the (A)component organic polymer.

In the curable composition of the invention, there may be incorporatedan adhesion promoter (C). The adhesion promoter (C) is not particularlylimited and there may be mentioned compounds containing a hydrolyzablesilyl group and another functional group within the molecule. Such agentmay produce a marked adhesiveness improving effect when the compositioncontaining the same is applied, under non-primer conditions or primertreatment conditions, to various adherends, namely inorganic substratesmade of glass, aluminum, stainless steel, zinc, copper, mortar, etc., ororganic substrates made of polyvinyl chloride, acrylics, polyesters,polyethylene, polypropylene, polycarbonates, etc. In the case ofapplication under non-primer conditions, the improving effect on theadhesiveness to various adherends is especially significant. Thecompound containing a hydrolyzable silyl group and another functionalgroup is capable of functioning also as a physical property modifier oran inorganic filler dispersibility improving agent, for instance.

As examples of the hydrolyzable silyl group in the compound containing ahydrolyzable silyl group and another functional group, which compoundmay be used as an adhesion promoter (C), there may be mentioned thosegroups represented by the general formula (7) wherein X is ahydrolyzable group. Specifically, mention may be made of those groupsalready enumerated hereinabove as hydrolyzable groups; from thehydrolysis rate viewpoint, a methoxy group and an ethoxy group, amongothers, are preferred. The number of hydrolyzable groups is preferably 2or more, in particular 3 or more.

As examples of the functional group other than the hydrolyzable silylgroup, there may be mentioned substituted or unsubstituted amino group,mercapto group, epoxy group, carboxyl group, vinyl group, isocyanatogroup, isocyanurato group and halogen, among others. Among these,substituted or unsubstituted amino group, epoxy group, isocyanato groupand isocyanurato group, among others, are preferred because of theirhigh adhesiveness improving effect; the amino group is particularlypreferred.

Specific examples of the adhesion promoter are isocyanate silanes suchas γ-isocyanatopropyltrimethoxysilane,γ-isocyanatopropyltriethoxysilane,γ-isocyanatopropylmethyldiethoxysilane,γ-isocyanatopropylmethyldimethoxysilane,(isocyanatomethyl)trimethoxysilane, and(isocyanatomethyl)dimethoxysilane; aminosilanes such asγ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane,γ-aminopropyltriisopropoxysilane, γ-aminopropylmethyldimethoxysilane,γ-aminopropylmethyldiethoxysilane,γ-(2-aminoethyl)aminopropyltrimethoxysilane,γ-(2-aminoethyl)aminopropylmethyldimethoxysilane,γ-(2-aminoethyl)aminopropyltriethoxysilane,γ-(2-aminoethyl)aminopropylmethyldiethoxysilane,γ-(2-aminoethyl)aminopropyltriisopropoxysilane,γ-(2-(2-aminoethyl)aminoethyl)aminopropyltrimethoxysilane,γ-(6-aminohexyl)aminopropyltrimethoxysilane,3-(N-ethylamino)-2-methylpropyltrimethoxysilane,2-aminoethylaminomethyltrimethoxysilane,N-cyclohexylaminomethyltriethoxysilane,N-cyclohexylaminomethyldiethoxymethylsilane,γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane,N-phenyl-γ-aminopropyltrimethoxysilane,N-phenylaminomethyltrimethoxysilane,N-benzyl-γ-aminopropyltrimethoxysilane,N-vinylbenzyl-γ-aminopropyltriethoxysilane,N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole,N-cyclohexylaminomethyltriethoxysilane,N-cyclohexylaminomethyldiethoxymethylsilane,N-phenylaminomethyltrimethoxysilane,(2-aminoethyl)aminomethyltrimethoxysilane andN,N′-bis[3-(trimethoxysilyl)propyl]ethylenediamine; ketimine typesilanes such asN-(1,3-dimethylbutylidene)-3-(triethoxysilyl)-1-propanamine;mercaptosilanes such as γ-mercaptopropyltrimethoxysilane,γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane,γ-mercaptopropylmethyldiethoxysilane, mercaptomethyltrimethoxysilane,and mercaptomethyltriethoxysilane; epoxysilanes such asγ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane,γ-glycidoxypropylmethyldimethoxysilane,β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, andβ-(3,4-epoxycyclohexyl)ethyltriethoxysilane; carboxysilanes such asβ-carboxyethyltriethoxysilane,β-carboxyethylphenylbis(2-methoxyethoxy)silane, andN-β-(carboxymethyl)aminoethyl-γ-aminopropyltrimethoxysilane; vinyl typeunsaturated group-containing silanes such as vinyltrimethoxysilane,vinyltriethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane,γ-acryloyloxypropyltriethoxysilane, andmethacryloyloxymethyltrimethoxysilane; halogen-containing silanes suchas γ-chloropropyltrimethoxysilane; isocyanurate silanes such astris(3-trimethoxysilylpropyl)isocyanurate; and the like. Reactionproducts of the above-mentioned aminosilanes and epoxysilanes, reactionproducts of the aminosilanes and isocyanate silanes, and the like may bementioned. Partially condensed silanes may also be mentioned. Examplesusable as the adhesion promoter may also include modified derivatives ofthese exemplified compounds such as amino-modified silyl polymers,silylated aminopolymers, unsaturated aminosilane complexes,phenylamino-long chain alkylsilane, aminosilylated silicones, andsilylated polyesters.

The above-exemplified adhesion promoters may be used alone or two ormore of them may be used as a mixture.

The level of addition of the component (C) to be used in the practice ofthe invention is preferably about 0.01 to 20 parts by eight, morepreferably about 0.1 to 10 parts by weight, particularly preferablyabout 1 to 7 parts by weight, per 100 parts by weight of the (A)component organic polymer. When the level of addition of the component(C) is lower than 0.01 part by weight, any sufficient level ofadhesiveness may not be obtained in some instances. Conversely, when thelevel of addition of the component (C) is above 20 parts by weight, itis sometimes impossible to obtain practical depth curability.

Examples of the adhesion promoters (C), which constitutes the invention,other than the above-mentioned compounds are not particularly limitedand for example, epoxy resins, phenol resins, sulfur, alkyl titanates,aromatic polyisocyanate and the like may be exemplified. Theabove-exemplified adhesion promoters may be used alone or two or more ofthem may be used as a mixture. However, epoxy resins may lower,according to the level of addition thereof, the catalytic activity ofthe component (B) and, therefore, the level of addition of epoxy resinsin the curable composition of the invention is preferably as low aspossible. The level of addition of epoxy resins is preferably not higherthan 5 parts by weight, more preferably not higher than 0.5 part byweight, per 100 parts by weight of the component (A); substantialabsence thereof is particularly preferred.

In the composition of the invention, there may be incorporated a filler.Specific examples of the filler may include reinforcing fillers such asfumed silica, precipitated silica, crystalline silica, fused silica,dolomite, silicic anhydride, hydrous silicic acid, and carbon black;fillers such as ground calcium carbonate, colloidal calcium carbonate,magnesium carbonate, china clay, calcined clay, clay, talc, titaniumoxide, bentonite, organic bentonite, ferric oxide, aluminum fine powder,flint powder, zinc oxide, activated zinc white, shirasu balloon, glassmicroballoon, organic microballoon of phenol resins and vinylidenechloride resins, and resin powder such as PVC powder and PMMA powder;fibrous fillers such as glass fibers and filaments; and the like. Theuse amount of the filler is preferably in a range from 1 to 250 parts byweight and more preferably in a range from 10 to 200 parts by weight per100 parts by weight of the polymer as the component (A).

In the case of obtaining a cured product with high strength by usingthese fillers, it is preferable to use mainly a filler selected fromfumed silica, precipitated silica, crystalline silica, fused silica,dolomite, silicic anhydride, hydrous silicic acid and carbon black,surface-treated fine calcium carbonate, calcined clay, clay, activatedzinc white and the like and if it is used in a range from 1 to 200 partsby weight per 100 parts by weight of the reactive silicongroup-containing organic polymer of the component (A), a preferredresult can be obtained. In the case where a cured product with lowstrength and high elongation at break is obtained, a preferred resultcan be attained by mainly using 5 to 200 parts by weight of a fillerselected from titanium oxide, calcium carbonate such as ground calciumcarbonate, magnesium carbonate, talc, ferric oxide, zinc oxide, shirasuballoon and the like per 100 parts by weight of the reactive silicongroup-containing organic polymer of the component (A). In general,calcium carbonate has more significant effect of improving the strengthat break, elongation at break, and adhesion of a cured product, as ithas higher specific surface area. These fillers may be used alone or twoor more of the may be used as a mixture. In the case where calciumcarbonate is used, it is desirable to use surface-treated fine calciumcarbonate with small particle diameter, ground calcium carbonate and thelike calcium carbonate with large particle diameter in combination. Thesurface-treated fine calcium carbonate is preferable to have a particlediameter of 0.5 μm or smaller and surface-treated with a fatty acid or afatty acid salt. Calcium carbonate with a large particle diameter ispreferable to have a particle diameter of 1 μm or larger, andsurface-untreated one may be used.

To improve the workability (antisagging property) of the composition anddeluster the cured product surface, it is preferable to add an organicballoon and/or an inorganic balloon. These fillers may besurface-treated and may be used alone or two ore more of them may beused in combination. To improve the workability (antisagging property),the particle diameter of the balloons is preferable to be 0.1 mm orsmaller. To deluster the cured product surface, the above-mentionedparticle diameter is preferable to be 5 to 300 μm.

Because the composition of the invention gives the cured product withexcellent chemical resistance, for example, the composition can besuitably applied to the joints of exterior walls of houses, such assiding boards, particularly ceramic siding boards, adhesives forexterior wall tiles, adhesives for exterior wall tiles that remain injoints as they are, and the like, but it is preferable to match thesealant design to the exterior wall design. As exterior walls, inparticular, those with a deluxe feeling created by spatter coating orincorporation of colored aggregates etc. become to be used. When a scalyor particulate substance not less smaller 0.1 mm, preferably about 0.1to 5.0 mm, in diameter is formulated into the composition of theinvention, the cured product matches up well with such deluxe-finishedexterior walls and, in addition, shows good chemical resistance. Thus,the composition is enabled to give the cured product capable ofretaining the appearance over years. When a particulate substance isformulated, a pebbled or sandstone-like coarse surface texture can beexpressed. When a scaly substance is formulated, an irregular surfaceresulting from its scaly shape can be expressed.

As described in Japanese Kokai Publication Hei-9-53063, the diameter,addition amount, and materials desirable for the scaly or particulatesubstance are as follows.

The diameter is 0.1 mm or larger and preferably about 0.1 to 5.0 mm andmay be selected properly in accordance with the material, the pattern,or the like of the exterior wall. Those substances with a diameter ofabout 0.2 to 5.0 mm or about 0.5 to 5.0 mm are also usable. In the caseof a scaly substance, the thickness to the diameter is proper to beabout 1/10 to ⅕ (that is, the diameter is proper to be about 0.01 to1.00 mm). The scaly or particulate substance is previously mixed with abase material of sealant and transported to the working field as asealant or mixed with the base material of sealant at the working fieldwhen used.

The scaly or particulate substance is added in a range from about 1 to200 parts by weight per 100 parts by weight of the composition such asthe sealant composition or the adhesive composition. The addition amountis properly selected in accordance with the size of the scaly orparticulate substance, the material and patterns of the exterior wall,and/or the like.

Examples to be used as the scaly or particulate substance may be naturalsubstances such as silica sand and mica; synthetic rubber, syntheticresins, and inorganic material such as alumina. To improve the designquality when the substance is used for filling the joint, the scaly orparticulate substance is colored with a proper color matched with thematerial and patterns of the exterior wall, and the like.

A preferable finishing method is described in Japanese Kokai PublicationHei-9-53063.

Also, if a balloon (preferably those with an average particle diameterof 0.1 mm or larger) is used for the same purpose, the pebbled orsandstone-like coarse surface texture can be obtained and the weight canbe reduced. As described in Japanese Kokai Publication Hei-10-251618,the diameter, the addition amount, and the type of a preferable balloonare as follows.

The balloon is a spherical filler having a hollow inside. The materialof the balloon may be inorganic materials such as glass, shirasu, andsilica; and organic materials such as phenol resins, urea resins,polystyrene, and Saran, however it is not limited to these examples andan inorganic material and an organic material may be compounded orlayered to form a plurality of layers. Inorganic, or organic, or theircomposite balloons may be used, for example. Also, the balloon to beused may be a single type one or a plurality of kinds of balloons ofdifferent materials may be used as a mixture. Further, the surface ofthe balloon to be used may be processed or coated, or may be treatedwith various kinds of surface treating agents. For example, an organicballoon may be coated with calcium carbonate, talc, titanium oxide, orthe like; or an inorganic balloon may be surface-treated with anadhesion promoter.

To obtain the pebbled or sandstone-like coarse surface texture, thediameter of the balloon is preferably 0.1 mm or larger. The balloonshaving a diameter of about 0.2 to 5.0 mm or about 0.5 to 5.0 mm are alsousable. In the case where the diameter is smaller than 0.1 mm, even if alarge quantity of the balloon is added, it only results in increase ofthe viscosity of the composition and no coarse surface texture can beobtained in some cases. The addition amount of the balloon may be easilydetermined in accordance with the coarseness of the desired pebbled orsandstone-like texture. Generally, it is desirable to add the balloonhaving a diameter of 0.1 mm or larger in an amount of 5 to 25% by volumein the composition. If the concentration by volume of the balloon islower than 5% by volume, no coarse surface texture can be obtained. Ifthe concentration exceeds 25% by volume, there is a tendency ofincreasing the viscosity of the sealant and the adhesive, worsening theworkability, increasing the modulus of the cured product, and thusdeteriorating the basic properties of the sealant and adhesive. Theconcentration by volume is particularly preferably 8 to 22% by volume interms of the balance with the basic properties of the sealant.

In the case of using balloons, it is allowed to use a slip preventingagent as described in Japanese Kokai Publication 2000-154368 and anamine compound, particularly a primary and/or a secondary amine with amelting point of 35° C. or higher as described in Japanese KokaiPublication 2001-164237 for making the surface of a cured product unevenand delustered.

Specific examples of the balloon are described in Japanese KokaiPublication Hei-2-129262, Japanese Kokai Publication Hei-4-8788,Japanese Kokai Publication Hei-4-173867, Japanese Kokai PublicationHei-5-1225, Japanese Kokai Publication Hei-7-113073, Japanese KokaiPublication Hei-9-53063, Japanese Kokai Publication Hei-10-251618,Japanese Kokai Publication 2000-154368, Japanese Kokai Publication2001-164237, WO 97/05201 and the like.

Even in the case where the composition of the invention containssealant-cured particles, the cured product can be provided with anuneven surface and an improved design. The diameter, addition amount,and usable materials etc. for the sealant-cured particles are preferableto be as described in Japanese Kokai Publication 2001-115142. Thediameter is preferably 0.1 to 1 mm and more preferably about 0.2 to 0.5mm. The addition amount is preferably in a range from 5 to 100% byweight and more preferably in a range from 20 to 50% by weight in thecurable composition. The usable materials may be urethane resins,silicones, modified silicones, polysulfide rubber and the like and theyare not particularly limited if they are usable for a sealant. Modifiedsilicone type sealants are preferable.

Further, a silicate may be used for the composition of the invention.The silicate works as a crosslinking agent and has a function ofimproving the recovery, durability, and creep resistance of the organicpolymer of the component (A). Further, it also has a function to improvethe adhesion and water-proof adhesion, and adhesion durability at a hightemperature and high humidity condition. Tetraalkoxysilane or partiallyhydrolyzed condensates of the tetraalkoxysilane may be used as thesilicate. In the case where a silicate is used, the use amount thereofis preferably 0.1 to 20 parts by weight and more preferably 0.5 to 10parts by weight per 100 parts by weight of the organic polymer of thecomponent (A).

Specific examples of the silicates are tetraalkoxysilanes (tetraalkylsilicates) such as tetramethoxysilane, tetraethoxysilane,ethoxytrimethoxysilane, dimethoxydiethoxysilane, methoxytriethoxysilane,tetra(n-propoxy)silane, tetra(iso-propoxy)silane, tetra(n-butoxy)silane,tetra(iso-butoxy)silane, and tetra(tert-butoxysilane), and theirpartially hydrolyzed condensates.

The partially hydrolyzed condensates of the tetraalkoxysilanes are morepreferable since the condensates are more effective to improve therecovery, durability and creep resistance of the curable composition ofthe invention than tetraalkoxysilanes.

The above-mentioned partially hydrolyzed condensates of thetetraalkoxysilanes are obtained by a common method of adding water to atetralkoxysilane and thereby partially hydrolyzing and condensing thetetraalkoxysilane. Further, commercialized products may be used as thepartially hydrolyzed condensates of the organosilicate compounds.Examples of the condensates are Methyl silicate 51 and Ethyl silicate 40(both manufactured by Colcoat Co., Ltd.), and the like.

A plasticizer may be used in the composition of the present invention.Addition of the plasticizer may adjust the viscosity and slump propertyof the curable composition, and the mechanical properties such astensile strength and elongation property of the cured product obtainedfrom the curable composition. As example of the plasticizer, there maybe mentioned phthalic acid esters such as dibutyl phthalate, diheptylphthalate, bis(2-ethylhexyl) phthalate, and butyl benzyl phthalate;non-aromatic dibasic acid esters such as dioctyl adipate, dioctylsebacate, dibutyl sebacate, and diisodecyl succinate; aliphatic esterssuch as butyl oleate and methyl acetylricinoleate; phosphoric acidesters such as tricresyl phosphate and tributyl phosphate; trimelliticacid esters; chloroparaffins; hydrocarbon oils such as alkyldiphenyl andpartially hydrogenated terphenyl; processed oils; epoxy plasticizerssuch as epoxylated soybean oil and benzyl epoxystearate.

Further, a polymer plasticizer may be used. If the polymer plasticizeris used, the initial physical properties can be maintained for a longduration as compared with the case of using a low molecular weightplasticizer, which is a plasticizer containing no polymer component inthe molecule. Further, the drying property (also called as coatability)is also improved in the case where an alkyd coating material is appliedto the cured product. Specific examples of the polymer plasticizer arevinyl polymers obtained by polymerizing vinyl monomers by variousmethods; polyalkylene glycol esters such as diethylene glycoldibenzoate, triethylene glycol dibenzoate, pentaerythritol ester;polyester-type plasticizers obtained from bibasic acids such as sebacicacid, adipic acid, azelaic acid, and phthalic acid and dihydric alcoholssuch as ethylene glycol, diethylene glycol, triethylene glycol,propylene glycol, and dipropylene glycol; polyether polyols such aspolyethylene glycol, polypropylene glycol, and polytetramethylene glycolhaving a molecular weight of 500 or higher and more preferably 1,000 orhigher, polyether polyol derivertives obtained by converting hydroxylgroups of these polyether polyols into ester groups, ether groups or thelike, and the like polyethers; polystyrenes such as polystyrene andpoly(α-methylstyrene); polybutadiene, polybutene, polyisobutylene,butadiene-acrylonitrile, polychloroprene and the like, however thepolymer plasticizer is not limited to these examples.

Among the exemplified polymer plasticizers, those which are compatiblewith the polymer of the component (A) are preferable. From thisviewpoint, polyethers and vinyl polymers are preferable. Further, fromthe viewpoint where the surface curability and deep part curability areimproved and curing delay after storage does not occur, polyethers arepreferably used and polypropylene glycol is more preferably used as aplasticizer. Additionally, in terms of the compatibility, weatherresistance, and heat resistance, vinyl polymers are preferable. Amongvinyl polymers, acrylic polymers and/or methacrylic polymers arepreferable and acrylic polymers such as polyacrylic alkyl esters aremore preferable. A synthesis method of the polymers is preferably aliving radical polymerization method and more preferably an atomtransfer radical polymerization method since these are suitable fornarrowing the molecular weight distribution and lowering the viscosity.Also, a polymer obtained by so-called SGO process, that is a polymerobtained by continuous bulk polymerization of an acrylic alkyl estermonomer at high temperature and high pressure as described in JapaneseKokai Publication 2001-207157 is preferably used.

The number average molecular weight of the polymer plasticizer ispreferably 500 to 15,000, more preferably 800 to 10,000, furthermorepreferably 1,000 to 8,000, even more preferably 1,000 to 5,000, and mostpreferably 1,000 to 3,000. If the molecular weight is too low, theplasticizer is eluted by heat or rain fall with the lapse of time so asto fail to maintain the initial physical properties for a long durationand therefore fail to improve the alkyd coatability. If the molecularweight of the polymer is too high, the viscosity is increased to worsenthe workability. Although the molecular weight distribution of thepolymer plasticizer is not particularly limited, it is preferablynarrow, namely a Mw/Mn ratio (weight average molecular weight/numberaverage molecular weight) is preferably lower than 1.80. It is furtherpreferably 1.70 or lower, furthermore preferably 1.60 or lower, evenmore preferably 1.50 or lower, particularly preferably 1.40 or lower,and most preferably 1.30 or lower.

The number average molecular weight is measured by a GPC method in thecase of a vinyl polymer and by a terminal group analysis method in thecase of a polyether polymer. The molecular weight distribution (Mw/Mn)is measured by the GPC method (conversion into polystyrene). The numberaverage molecular weight and molecular weight distribution can bemeasured as values on the polystyrene equivalent basis using, forexample, the following:

Pumping system: Tosoh HLC-8120 GPC;

Column: Tosoh TSK-GEL H type;

Solvent: THF.

The measurement methods are not particularly restricted.

The polymer plasticizer may or may not contain the reactive silicongroup. In the case of containing the reactive silicon group, it works asa reactive plasticizer and prevents transfer of the plasticizer from thecured product. In the case where the reactive silicon group iscontained, the number of the group is preferably 1 or lower and morepreferably 0.8 or lower on average per one molecule. In the case wherethe plasticizer having a reactive silicon group, particularly anoxyalkylene polymer having a reactive silicon group, is used, the numberaverage molecular weight thereof is necessarily to be lower than that ofthe polymer of the component (A).

The plasticizer may be used alone or two or more of these may be used incombination. Further, a low molecular weight plasticizer and the polymerplasticizer may be used in combination. These plasticizers may be addedat the time of polymer production.

The use amount of the plasticizer is preferably 5 to 150 parts byweight, more preferably 10 to 120 parts by weight, and still morepreferably 20 to 100 parts by weight, per 100 parts by weight of thepolymer of the component (A). If it is less than 5 parts by weight, theeffect as a plasticizer is not exhibited and if it exceeds 150 parts byweight, the mechanical strength of the cured product tends to becomeinsufficient.

Also, thermally-expansive hollow microspheres described in JapaneseKokai Publication 2004-51701, Japanese Kokai Publication 2004-66749 andthe like can be used. The phrase “thermally-expansive hollowmicrospheres” means plastic spheres obtained by spherically enclosinglow boiling point compounds such as a hydrocarbon with 1 to 5 carbonatoms by a polymer coating material (vinylidene chloride copolymer, anacrylonitrile copolymer, or a vinylidene chloride-acrylonitrilecopolymer). Heating of the adhesion part formed using the composition ofthe invention increases the gas pressure in the coat of thethermally-expansive hollow microspheres and softens the polymer coatingmaterial to drastically expand the volume and separate the adhesioninterface. Addition of the thermally-expansive hollow microspheres givesa thermally peelable adhesive composition which can be easily peeled byheating at the time of disposal without breaking materials and using anyorganic solvents.

The composition of the invention may contain a pressure-sensitiveadhesion promoter. The pressure-sensitive adhesion promoter is notparticularly limited and commonly used ones may be used regardless ofthe phase thereof being solid or liquid at an ambient temperature.Specific examples thereof may be styrene block copolymers, hydrogenatedproducts thereof, phenol resins, modified phenol resins (e.g. cashewoil-modified phenol resins, tall oil-modified phenol resins, and thelike), terpene phenol resins, xylene-phenol resins,cyclopentadiene-phenol resins, cumarone indene resins, rosin resins,rosin ester resins, hydrogenated rosin ester resins, xylene resins, lowmolecular weight polystyrene resins, styrene copolymer resins, petroleumresins (e.g., C5 hydrocarbon resins, C9 hydrocarbon resins, C5hydrocarbon-C9 hydrocarbon copolymer resins, and the like), hydrogenatedpetroleum resins, terpene resins, DCPD resins petroleum resins, and thelike. They may be used alone and two or more of them may be used incombination. Examples of the styrene block copolymers and thehydrogenated products thereof are styrene-butadiene-styrene blockcopolymer (SBS), styrene-isoprene-styrene block copolymer (SIS),styrene-ethylene-butylene-styrene block copolymer (SEBS),styrene-ethylene-propylene-styrene block copolymer (SEPS),styrene-isobutylene-styrene block copolymer (SIBS), and the like. Theabove-mentioned pressure-sensitive adhesion promoters may be used aloneor two or more of them may be used in combination.

Preferably, the pressure-sensitive adhesion promoter may be used in arange from 5 to 1,000 parts by weight and more preferably 10 to 100parts by weight per 100 parts by weight of the component (A).

The composition of the invention may contain a solvent or a diluent. Thesolvent or diluent is not particularly limited and aliphatichydrocarbons, aromatic hydrocarbons, alicyclic hydrocarbons, halogenatedhydrocarbons, alcohols, esters, ketones, ethers and the like may beused. In the case where a solvent or diluent is used, in terms of airpollution at the time of using the composition indoors, the boilingpoint of the solvent is preferably 150° C. or higher, more preferably200° C. or higher, and further preferably 250° C. or higher. Theabove-mentioned solvents or diluents may be used alone or two or more ofthem may be used in combination.

Based on the necessity, the curable composition of the invention maycontain a physical property modifier for adjusting tensile properties ofthe cured product to be obtained. The physical property modifier is notparticularly limited and examples thereof are alkylalkoxysilanes such asmethyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane,and n-propyltrimethoxysilane; alkylisopropenoxysilanes such asdimethyldiisopropenoxysilane, methyltriisopropenoxysilane,γ-glycidoxypropylmethyldiisopropenoxysilane; functional group-containingalkoxysilanes such as γ-glycidoxypropylmethyldimethoxysilane,γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane,vinyldimethylmethoxysilane, γ-aminopropyltrimethoxysilane,N-(β-aminoethyl)aminopropylmethyldimethoxysilane,γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane;silicone vanishes; polysiloxanes; and the like. Use of theabove-mentioned physical property modifiers increases the hardness ofthe cured product obtained by curing the composition of the invention,or, on the contrary, decreases the hardness in order to increase theelongation at break. The above-mentioned physical property modifiers maybe used alone or two or more of them may be used in combination.

Particularly, a compound from which a compound containing a monovalentsilanol group in a molecule is produced by hydrolysis has a function ofdecreasing the modulus of the cured product without worsening thestickiness of the cured product surface. Particularly, a compound fromwhich trimethylsilanol is produced is preferable. Examples of thecompound from which a compound containing a monovalent silanol group ina molecule is produced by hydrolysis are compounds described in JapaneseKokai Publication Hei-5-117521. Further, examples of the compound mayinclude derivatives of alkylalcohols, such as hexanol, octanol anddecanol, from which silicon compounds forming R₃SiOH such astrimethylsilanol are produced by hydrolysis; derivatives of polyhydricalcohols having 3 or more hydroxyl groups, such as trimethylolpropane,glycerin, pentaerythritol and sorbitol, as described in Japanese KokaiPublication Hei-11-241029, from which silicone compounds forming R₃SiOHsuch as trimethylsilanol are produced by hydrolysis.

Examples may further include oxypropylene polymer derivatives asdescribed in Japanese Kokai Publication Hei-7-258534 from which siliconcompounds forming R₃SiOH such as trimethylsilanol are produced byhydrolysis. Usable examples may also include polymers having asilicon-containing group to be converted into monosilanol-containingcompounds by hydrolysis with a crosslinkable and hydrolysablesilicon-containing group, as described in Japanese Kokai PublicationHei-6-279693.

Preferably, the physical property modifier is used in a range from 0.1to 20 parts by weight and more preferably from 0.5 to 10 parts by weightper 100 parts by weight of the organic polymer (A) having a reactivesilicon group.

The curable composition of the invention may contain a thixotropic agent(antisagging agent) for preventing sagging in order to improve theworkability, according to need. The antisagging agent is notparticularly limited and polyamide waxes; hydrogenated castor oilderivatives; metal soaps such as calcium stearate, aluminum stearate,and barium stearate; and the like. Further, if rubber powders with aparticle diameter of 10 to 500 μm as described in Japanese KokaiPublication Hei-11-349916 and/or organic fibers as described in JapaneseKokai Publication 2003-155389 are used, the composition with highthixotropy and good workability can be obtained. These thixotropicagents (antisagging agents) may be used alone or two or more of them maybe used in combination. The thixotropic agent is preferably used in arange from 0.1 to 20 parts by weight per 100 parts by weight of thetotal of the component (A) and the component (B).

The composition of the invention may contain a compound having an epoxygroup in one molecule. Addition of the compound having an epoxy groupincreases the recovery of the cured product. Examples of the compoundhaving an epoxy group may include epoxylated unsaturated fats and oils,epoxylated unsaturated fatty acid esters, alicyclic epoxy compounds andepichlorohydrin derivatives, mixtures of these compounds, and the like.More particular examples thereof are epoxylated soybean oils, epoxylatedlinseed oil, bis(2-ethylhexyl)-4,5-epoxycyclohexane-1,2-dicarboxylate(E-PS), epoxyoctyl stearate, epoxybutyl stearate and the like. E-PS isparticularly preferable among them. The epoxy compound is preferablyused in a range from 0.5 to 50 parts by weight per 100 parts by weightof the organic polymer (A) having reactive silicon group.

The composition of the invention may contain a photocurable substance.Addition of the photocurable substance makes it possible to form acoating of the photocurable substance on the cured product surface andto improve the stickiness and weather resistance of the cured product.The photocurable substance is a compound causing chemical changes in themolecular structure within a very short time by light radiation andthereby causing changes in physical properties such as curing. This kindof compounds is known well in form of an organic monomer, an oligomer, aresin, a composition containing them, and many others. All kinds ofcommercialized products may be used. Typical examples thereof areunsaturated acrylic compounds, polyvinyl cinnamates, azido resins andthe like. The unsaturated acrylic compounds may include monomers andoligomers having one or several acrylic or methacrylic unsaturatedgroups, and mixtures thereof; e.g. monomers and oligoesters with amolecular weight of 10,000 or lower, such as propylene (or butylene, orethylene) glycol di(meth)acrylate and neopentyl glycol di(meth)acrylate,and the like. As more specific examples, there may be mentioned suchspecial acrylates (difunctional) as ARONIX M-210, ARONIX M-215, ARONIXM-220, ARONIX M-233, ARONIX M-240, and ARONIX M-245; such trifunctionalones as ARONIX M-305, ARONIX M-309, ARONIXM-310, ARONIXM-315,ARONIXM-320, and ARONIXM-325; such polyfunctional ones as ARONIX M-400;and the like. Compounds containing an acrylic functional group areparticularly preferable and compounds containing 3 or more functionalgroups on average in one molecule are more preferable. (All theabove-mentioned ARONIX species are products of Toagosei Co., Ltd.)

Examples of the polyvinyl cinnamates are photosensitive resins having acinnamoyl group as a photosensitive group and obtained by esterifying apolyvinyl alcohol with a cinnamic acid and many polyvinyl cinnamatederivatives as well. The azido resins are known as photosensitive resinshaving an azido group as a photosensitive group and in general, mayinclude photosensitive rubber liquids obtained by adding a diazidocompound as a photosensitizer, and further, detailed examples are foundin “Kankosei Jushi (Photosensitive Resins)” (published Mar. 17, 1972 byInsatsu Gakkai Shuppanbu, pages 93 ff, 106 ff, 117 ff). They may be usedalone or as a mixture and if necessary, a sensitizer may be added. Inthe case where a sensitizer such as ketones and nitro compounds or apromoter such as amines is added, the effect is improved in some cases.The photocurable substance is preferably used in a range from 0.1 to 20parts by weight and more preferably in a range from 0.5 to 10 parts byweight per 100 parts by weight of the organic polymer (A) having areactive silicon group. If it is lower than 0.1 parts by weight, theweather resistance increasing effect is not caused and if it exceeds 20parts by weight, the cured product tends to become so hard to causecracks.

The composition of the invention may contain an oxygen-curablesubstance. The oxygen-curable substance may include unsaturatedcompounds reactive on oxygen in the air and has function of forming acured coating in the vicinity of the cured product surface by reactionwith oxygen in the air and thereby preventing stickiness of the surfaceand adhesion of the dust and dirt to the cured product surface. Specificexamples of the oxygen-curable substance are dry oils represented bytung oil and linseed oil and various kinds of alkyd resins obtained bymodifying these compounds; acrylic polymers, epoxy resins, and siliconresins modified by dry oils; liquid polymers such as polymers of1,2-polybutadiene, 1,4-polybutadiene, C₅-C₈ diene obtained bypolymerization or copolymerization of diene compounds such as butadiene,chloroprene, isoprene, and 1,3-pentadiene, liquid copolymers such as NBRand SBR obtained by copolymerization of the diene compounds with acopolymerizable monomer such as acrylonitrile and stylene in a mannerthat the diene compounds form main components, various modifiedcompounds of them (e.g. maleated derivatives, boiled oil-modifiedderivatives, and the like), and the like. They may be used alone or twoor more of them may be used in combination. Tung oil and liquid dienepolymers are particularly preferable among them. Further, combinationuse of a catalyst promoting the oxidation curing reaction or a metaldrier may increase the effect in some cases. Examples of the catalystand the metal drier are metal salts such as cobalt naphthenate, leadnaphthenate, zirconium naphthenate, cobalt octylate, and zirconiumoctylate, amine compounds, and the like. The use amount of theoxygen-curable substance is preferably in a range from 0.1 to 20 partsby weight and more preferably from 0.5 to 10 parts by weight per 100parts by weight of the organic polymer (A) having a reactive silicongroup. If the use amount is lower than 0.1 parts by weight, thecontamination improvement effect becomes insufficient and if it exceeds20 parts by weight, the tensile property and the like of the curedproduct tends to be deteriorated. As described in Japanese KokaiPublication Hei-3-160053, the oxygen-curable substance may be usedpreferably in combination with the photocurable substance.

The composition of the invention may contain an antioxidant (anti-agingagent). If the antioxidant is used, the heat resistance of the curedproduct can be increased. Examples of the antioxidant are hinderedphenol-type antioxidants, monophenol-type antioxidants, bisphenol-typeantioxidants, and polyphenol-type antioxidants, and hinderd phenol-typeantioxidants are particularly preferable. Similarly, usable examplesthereof are hindered amine-type light stabilizers commercialized asTINUVIN 622LD, TINUVIN144, CHIMASSORB 944LD, and CHIMASSORB 119FL (allmanufactured by Ciba Specialty Chemicals), MARK LA-57, MARK LA-62, MARKLA-67, MARK LA-63, and MARK LA-68 (all manufactured by Adeka ArgusChemical Co., Ltd.), Sanol LS-770, Sanol LS-765, Sanol LS-292, SanolLS-2626, Sanol LS-1114, and Sanol LS-744 (all manufactured by SankyoCo., Ltd.). Specific examples of the antioxidant are also described inJapanese Kokai Publication Hei-4-283259 and Japanese Kokai Publication9-194731. The use amount of the antioxidant is preferably in a rangefrom 0.1 to 10 parts by weight and more preferably from 0.2 to 5 partsby weight per 100 parts by weight of the organic polymer (A) having areactive silicon group.

The composition of the invention may contain a light stabilizer. If thelight stabilizer is used, the photo-oxidation deterioration of the curedproduct can be prevented. Examples to be used as the light stabilizermay include benzotriazole compounds, hindered amine compounds, benzoatecompounds and the like, and hindered amine compounds are particularlypreferable. The use amount of the light stabilizer is preferably in arange from 0.1 to 10 parts by weight and more preferably from 0.2 to 5parts by weight per 100 parts by weight of the organic polymer (A)having a reactive silicon group. Specific examples of the lightstabilizer are also described in Japanese Kokai PublicationHei-9-194731.

In the case where the photocurable substance is added to the compositionof the invention, particularly in the case where an unsaturated acryliccompound is added, it is preferable to use a tertiary amine-containinghindered amine-type light stabilizer as described in Japanese KokaiPublication Hei-5-70531 as the hindered amine-type light stabilizer interms of the improvement of the storage stability of the composition.Examples of the tertiary amine-containing hindered amine-type lightstabilizer are TINUVIN 622LD, TINUVIN 144, and CHIMASSORB 119FL (allmanufactured by Ciba Specialty Chemicals); MARK LA-57, LA-62, LA-67, andLA-63 (all manufactured by Adeka Argus Chemical Co., Ltd.); SanolLS-765, LS-292, LS-2626, LS-1114, and LS-744 (all manufactured by SankyoCo., Ltd.); and the like stabilizers.

The composition of the invention may contain an ultraviolet absorber.Use of the ultraviolet absorber can increase the weather resistance ofthe surface of the cured product. Examples of the ultraviolet absorbermay be benzophenone compounds, benzotriazole compounds, salicylatecompounds, substituted tolyl compounds, metal chelate compounds and thelike, and benzotriazole compounds are particularly preferable. The useamount of the ultraviolet absorber is preferably in a range from 0.1 to10 parts by weight and more preferably from 0.2 to 5 parts by weight per100 parts by weight of the organic polymer (A) having a reactive silicongroup. It is preferable to use a phenol-type or hindered phenol-typeantioxidant, a hindered amine-type light stabilizer, and abenzotriazole-type ultraviolet absorber in combination.

The curable composition of the invention may contain a phosphorus-typeplasticizer such as ammonium polyphosphate and tricresyl phosphate and aflame retardant such as aluminum hydroxide, magnesium hydroxide, andthermally expansive graphite. The above-mentioned flame retardant may beused alone or two or more of them may be used in combination.

The flame retardant is used in a range from 5 to 200 parts by weight andpreferably from 10 to 100 parts by weight per 100 parts by weight of thecomponent (A).

A solvent may be used in the composition of the invention for reducingthe viscosity of the composition, enhancing the thixotropic propertiesand improving the workability The solvent is not particularly restrictedbut includes various compounds. Specific examples are hydrocarbonsolvents such as toluene, xylene, heptane, hexane and petroleumsolvents, halogenated solvents such as trichloroethylene, ester solventssuch as ethyl acetate and butyl acetate, ketone solvents such asacetone, methyl ethyl ketone and methyl isobutyl ketone, alcoholsolvents such as methanol, ethanol and isopropyl alcohol, and siliconesolvents such as hexamethylcyclotrisiloxane,octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. Thesesolvents may be singly or two or more of them may be used incombination.

However, the use of a solvent at high addition levels sometimes resultsin increased toxicity to human bodies and further results in volumedecreases or shrinkage of cured products in some instances. Therefore,the solvent addition level is preferably not higher than 3 parts byweight, more preferably not higher than 1 part by weight, per 100 partsby weight of the (A) component organic polymer; substantial absence ofany solvent is most preferred.

The curable composition of the invention may contain various kinds ofadditives for adjusting the various physical properties of the curablecomposition or the cured product of the composition according to need.Examples of the additives are a curability adjustment agent, a radicalinhibitor, a metal inactivation agent, an ozone deterioration-preventingagent, a phosphorus-type peroxide decomposing agent, a lubricant, apigment, a foaming agent, a repellent for ants, anti-fungal agent andthe like. These various additives may be used alone or two or more ofthem may be used in combination. Specific examples other than theexamples of the additives described in this specification are describedin Japanese Kokoku Publication Hei-4-69659, Japanese Kokoku PublicationHei-7-108928, Japanese Kokai Publication Sho-63-254149, Japanese KokaiPublication Sho-64-22904, Japanese Kokai Publication 2001-72854 and thelike.

The curable composition of the invention may be produced as a one-packformulation, which is to be cured by the moisture in the air afterapplication, by compounding all the components/ingredients and tightlysealing in a container for storage, or as a two-pack type formulation byseparately mixing, as curing agents, components such as a curingcatalyst, a filler, a plasticizer, and water and mixing the mixture witha polymer composition together prior to use. In terms of theworkability, the one-pack is preferable.

In the case where the curable composition is a one-pack type one, sinceall of the components are previously mixed, it is preferable topreviously dehydrate and dry the components containing water prior touse or to carry out dehydration by vacuum etc. during the components arekneaded. In the case where the curable composition is two-pack type,gelation hardly occurs if a slight amount of water is contained in thecomponent mixture, since there is no need to add a curing catalyst tothe base components containing the reactive silyl group-containingpolymer. However, in the case where long term storage stability isrequired, it is preferable to carry out dehydration and drying. In thecase where the composition is a powder or the like solid, thedehydration and drying method is preferably heat drying or vacuumdehydration and in the case where it is liquid, vacuum dehydration ordehydration using a synthetic zeolite, activated alumina, silica gel,burnt lime, magnesium oxide or the like is preferable. In addition tothe above-mentioned dehydration and drying methods, an alkoxysilanecompound such as n-propyltrimethoxysilane, vinyltrimethoxysilane,vinylmethyldimethoxysilane, methyl silicate, ethyl silicate,γ-mercaptopropylmethyldimethoxysilane,γ-mercaptopropylmethyldiethoxysilane, andγ-glycidoxypropyltrimethoxysilane may be added in order to causereaction with water for dehydration. Alternatively, an oxazolidinecompound such as 3-ethyl-2-methyl-2-(3-methylbutyl)-1,3-oxazolidine maybe added and reacted with water for dehydration. Further, a small amountof an isocyanate compound may be added in order to cause reaction of itsisocyanate group with water for dehydration. Addition of thealkoxysilane compound, the oxazolidine compound, and the isocyanatecompound improve the storage stability.

The use amount of a dehydration agent, particularly a silicon compoundreactive with water such as vinyltrimethoxysilane may be preferably in arange from 0.1 to 20 parts by weight and more preferably from 0.5 to 10parts by weight per 100 parts by weight of the reactive silylgroup-containing organic polymer (A).

The method for producing the curable composition of the invention is notparticularly limited and a common method may be employed which involves,for example, formulating the above-mentioned components, kneading thecomponents by a mixer, a roll, a kneader or the like stirring device atan ambient temperature or under heating condition; or dissolving thecomponents by adding a small amount of a proper solvent for mixing.

When the curable composition of the invention is exposed to theatmosphere, the composition forms a three-dimensional mesh structure byreaction with water and then is cured into a solid having rubber-likeelasticity.

EFFECT OF THE INVENTION

The curable composition of the present invention allows slight bleedoutof a liquid compound to occur to the cured product and shows goodcurability and adhesiveness using a non-organotin curing catalyst, anamine compound, as a silanol condensation catalyst.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the invention will be described more in detail with reference toExamples and Comparative Examples, however the invention should not belimited to these examples.

SYNTHESIS EXAMPLE 1

Propylene oxide was polymerized by using polyoxypropylene diol with amolecular weight of about 2,000 as an initiator and a zinchexacyanocobaltate-glyme complex catalyst in order to obtain apolypropylene oxide with a number average molecular weight of about25,500 (measured by using HLC-8120 GPC manufactured by Tosoh Corporationas a solution transporting system; TSK-GEL H column manufactured byTosoh Corporation as a column; and THF as a solvent: the molecularweight was determined on the basis of conversion into polystyrene).Next, a NaOMe methanol solution of which the NaOMe content was 1.2equivalent weights relative to the hydroxyl groups of the hydroxylgroup-terminated polypropylene oxide was added followed by removal ofmethanol, and then allyl chloride was added thereto in order to convertthe terminal hydroxyl groups of the hydroxyl group-terminatedpolypropylene oxide into allyl groups. Unreacted allyl chloride was thenremoved by vacuum evaporation. 300 parts by weight of n-hexane and 300parts by weight of water were added to 100 parts by weight of the allylgroup-terminated unpurified polypropylene oxide thus obtained, theobtained mixture was stirred, and then water was removed bycentrifugation. After that, 300 parts by weight of water was furtheradded to the obtained hexane solution with stirring, water was removedagain by centrifugation and successively, hexane was removed by vacuumevaporation in order to obtain an allyl group-terminated bifunctionalpolypropylene oxide with a number average molecular weight of about25,500 (hereinafter, referred to as “polymer P”).

Using 150 ppm of an isopropanol solution of a platinum-vinylsiloxanecomplex with 3% by weight of platinum content as a catalyst, 100 partsby weight of the polymer P was reacted with 0.93 parts by weight ofmethyldimethoxysilane at 90° C. for 5 hours to obtain amethyldimethoxysilyl group-terminated polyoxypropylene polymer (A-1).Further, the ratio (defined as S) of the peak integration value of theterminal allyl group (—CH₂—CH═CH₂) (near 5.1 ppm) relative to the peakintegration value of 1,000 of the methyl group (near 1.2 ppm) of thepolypropylene oxide main chain of the bifunctional polymer P and theratio (defined as S′) of the peak integration value of the methylenegroup (—CH₂—CH₂—CH₂—Si(CH₃)(OCH₃)₂) (near 0.6 ppm) bonded to the siliconatom of the terminal silyl group relative to the peak integration valueof 1,000 of the methyl group (near 1.2 ppm) of the polypropylene oxidemain chain of the silyl group-terminated polypropylene oxide (A-1) afterhydrosilylation reaction were determined by ¹H-NMR measurement (measuredby using JNM-LA 400 manufactured by Nippon Electric Co., Ltd., and inCDCl₃ solvent). Then, the silyl group introduction ratio (S′/S)×2 (thisnumber accounts for “bifunctional”) was determined to find that 1.3terminal methyldimethoxysilyl groups were introduced per one molecule onaverage.

SYNTHESIS EXAMPLE 2

Using 150 ppm of an isopropanol solution of a platinum-vinylsiloxanecomplex with 3% by weight of platinum content as a catalyst, 100 partsby weight of the polymer P was reacted with 1.1 parts by weight oftrimethoxysilane at 90° C. for 5 hours to obtain a trimethoxysilylgroup-terminated polyoxypropylene polymer (A-2). Then, the silyl groupintroduction ratio (S′/S)×2 (this number accounts for “bifunctional”)was determined, in the same manner as in Synthesis Example 1 by ¹H-NMRmeasurement (measured by using JNM-LA 400 manufactured by NipponElectric Co., Ltd., and in CDCl₃ solvent), to find that 1.3 terminaltrimethoxysilyl groups were introduced per one molecule on average.

SYNTHESIS EXAMPLE 3

Propylene oxide was polymerized by using polyoxypropylene triol with amolecular weight of about 3,000 as an initiator and a zinchexacyanocobaltate-glyme complex catalyst in order to obtain apolypropylene oxide with a number average molecular weight of about26,000 (measured by using HLC-8120 GPC manufactured by Tosoh Corporationas a solution transporting system; TSK-GEL H column manufactured byTosoh Corporation as a column; and THF as a solvent: the molecularweight was determined on the basis of conversion into polystyrene).Next, a NaOMe methanol solution of which the NaOMe content was 1.2equivalent weights relative to the hydroxyl groups of the hydroxylgroup-terminated polypropylene oxide was added followed by removal ofmethanol, and then allyl chloride was added thereto in order to convertthe terminal hydroxyl groups of the hydroxyl group-terminatedpolypropylene oxide into allyl groups. Unreacted allyl chloride was thenremoved by vacuum evaporation. 300 parts by weight of n-hexane and 300parts by weight of water were added to 100 parts by weight of theallyl-terminated unpurified polypropylene oxide thus obtained, theobtained mixture was stirred, and then water was removed bycentrifugation. After that, 300 parts by weight of water was furtheradded to the obtained hexane solution with stirring, water was removedagain by centrifugation and successively, hexane was removed by vacuumevaporation in order to obtain an allyl group-terminated trifunctionalpolypropylene oxide with a number average molecular weight of about26,000. Using 150 ppm of an isopropanol solution of aplatinum-vinylsiloxane complex with 3% by weight of platinum content asa catalyst, 100 parts by weight of the allyl group-terminatedtrifunctional polypropylene oxide thus obtained was reacted with 1.4parts by weight of methyldimethoxysilane at 90° C. for 5 hours to obtaina methyldimethoxysilyl group-terminated polyoxypropylene polymer (A-3).Then, the silyl group introduction ratio (S′/S)×3 (this number accountsfor “trifunctional”) was determined by ¹H-NMR measurement (measured byusing JNM-LA 400 manufactured by Nippon Electric Co., Ltd., and in CDCl₃solvent), as in Synthesis Example 1, to find that 2.4 terminalmethyldimethoxysilyl groups were introduced per one molecule on average.

EXAMPLES 1 AND 2 AND COMPARATIVE EXAMPLE 1

Using a three-roll paint mill, 100 parts by weight of themethyldimethoxysilyl group-terminated polyoxypropylene polymer (A-1)obtained in Synthesis Example 1 was thoroughly kneaded with 50 parts byweight of surface-treated colloidal calcium carbonate (product ofShiraishi Kogyo: Hakuenka CCR) and 50 parts by weight of ground calciumcarbonate (product of Shiraishi Calcium: Whiton SB). The mixture wasdehydrated under vacuum at 120° C. for 2 hours for use as a chiefmaterial. To the chief material were added, under constant temperatureand constant humidity conditions (25° C., 50%), 3 parts by weight ofγ-aminopropyltrimethoxysilane (product of Dow Corning Toray: A-1110) asan adhesion promoter and an amine compound specified in Table 1 as asilanol condensation catalyst in an amount (parts by weight) specifiedin Table 1, and the mixture was kneaded using a spatula for two minutes.After thorough deaeration of the compound, there was obtained a curablecomposition.

(Skinning Time Measurement)

Samples were prepared by applying each curable composition obtained ontoa polyethylene sheet and spreading the same to a thickness of 3 mm,followed by surface smoothening. The time of finishing of samplepreparation was regarded as the curing start time, and the skinning timewas measured as the time required for the curable composition, touchedon the surface with a spatula, to no longer adhere to the spatula. Theresults thus obtained are shown in Table 1.

(Bleedout Evaluation)

Each sample after the above-mentioned skinning time measurement wasallowed to stand under constant-temperature and constant-humidityconditions of 23° C. and 50% for 24 hours and then the surface thereofwas touched with a finger. When there was no liquid compound that hadbled out on the sample surface, hence the finger was not stained withany such compound, the sample surface was evaluated as “no” bleedoutand, when the finger was stained with such a liquid compound(s), thesurface was evaluated as bleedout “yes”.

Further, the state, at 23° C., of each amine compound used was observedby the eye and judged as “solid” or “liquid”. The results are shown inTable 1.

TABLE 1 Comparative Example Example 1 2 1 Chief Organic polymer (A) A-1100 100 100 material Calcium carbonate Hakuenka CCR 50 50 50 Whiton SB50 50 50 Adhesion promoter (C) A-1110⁽¹⁾ 3 3 3 Amidine compound1,5,7-Triazabicyclo[4.4.0]dec- 3 or guanidine 5-ene solution⁽²⁾ compound(B) 1-n-Butylbiguanide solution⁽³⁾ 4 Amine compound DBU⁽⁴⁾ 2 State ofamine compound at 23° C. Solid Solid Liquid Results Bleedout No No YesCurability (skinning time) 14 min 5 hrs ≧24 hrs ⁽¹⁾A-1110:γ-aminopropyltrimethoxysilane ⁽²⁾1,5,7-Triazabicyclo[4.4.0]dec-5-enesolution: 67% solution of 1,5,7-Triazabicyclo[4.4.0]dec-5-ene inmethanol ⁽³⁾1-n-Butylbiguanide solution: 50% solution of1-n-butylbiguanide in methanol ⁽⁴⁾DBU:1,8-diazabicyclo[5.4.0]undec-7-ene

As shown in Table 1, when 1,5,7-triazabicyclo[4.4.0]dec-5-ene or1-n-butylbiguanide, which occurs as a solid at 23° C. (having a meltingpoint not lower than 23° C.), was used as the silanol condensationcatalyst, no bleedout was found and the curability was good in each case(Examples 1 and 2). On the contrary, when DBU, which occurs as a liquidat 23° C. (having a melting point lower than 23° C.), was used, bleedingout occurred and the curability also poor

COMPARATIVE EXAMPLE 1 EXAMPLES 3 AND 4 AND COMPARATIVE EXAMPLES 2 and 3

Using a three-roll paint mill, 100 parts by weight of thetrimethoxysilyl group-terminated polyoxypropylene polymer (A-2) obtainedin Synthesis Example 2 was thoroughly kneaded with 120 parts by weightof surface-treated colloidal calcium carbonate (product of ShiraishiKogyo: Hakuenka CCR), 20 parts by weight of titanium oxide (product ofIshihara Sangyo: Tipaque R-820), 55 parts by weight of a plasticizer(product of Kyowa Hakko Kogyo: DIDP), 2 parts by weight of a thixotropicagent (product of Kusumoto Chemicals: Disparlon #6500), 1 part by weightof an ultraviolet absorber (product of Sumitomo Chemical: Sumisorb 400),1 part by weight of a light stabilizer (product of Sankyo Lifetech:Sanol LS 770) and 1 part by weight of an antioxidant (product of YSK,Inc.: Yunox KC). The mixture was dehydrated under vacuum at 120° C. for2 hours for use as a chief material. To the chief material were added,under constant temperature and constant humidity conditions (23° C.,50%), 5 parts by weight of γ-aminopropyltrimethoxysilane (product of DowCorning Toray: A-1110) and 3 parts by weight ofγ-glycidoxypropyltrimethoxysilane (product of Dow Corning Toray: A-187)each as an adhesion promoter and an amine compound specified in Table 2as a silanol condensation catalyst in an amount (parts by weight)specified in Table 2, and skinning time measurement and bleedoutevaluation were carried out in the same manner as in Example 1. Further,the state, at 23° C., of each amine compound used was observed by theeye and judged as “solid” or “liquid”. The results are shown in Table 2.

TABLE 2 Comparative Example Example 3 4 2 3 Chief Organic polymer (A)A-2 100 100 100 100 material Calcium carbonate Hakuenka CCR 120 120 120120 Titanium oxide Tipaque R-820 20 20 20 20 Plasticizer DIDP 55 55 5555 Thixotropic agent Disparlon #6500 2 2 2 2 Ultraviolet absorberSumisorb 400 1 1 1 1 Light stabilizer Sanol LS770 1 1 1 1 AntioxidantYunox KC 1 1 1 1 Adhesion promoter (C) A-1110⁽¹⁾ 5 5 5 5 A-187⁽²⁾ 3 3 33 Amidine compound 1-n-Butylguanidine solution⁽³⁾ 6 or guanidine1-n-Butylbiguanide solution⁽⁴⁾ 6 compound (B) Amine compound1-(o-Tolyl)biguanide 4 DBU⁽⁵⁾ 5 State of amine compound at 23° C. SolidSolid Solid Liquid Results Bleedout No No No Yes Curability (skinningtime) 18 min 20 min 67 min 27 min ⁽¹⁾A-1110:γ-aminopropyltrimethoxysilane ⁽²⁾A-187:γ-glycidoxypropyltrimethoxysilane ⁽³⁾1-n-Butylguanidine solution: 50%solution of 1-n-butylguanidine in methanol ⁽⁴⁾1-n-Butylbiguanidesolution: 33% solution of 1-n-butylbiguanide in methanol ⁽⁵⁾DBU:1,8-diazabicyclo[5.4.0]undec-7-ene

As shown in Table 2, when 1-n-butylguanidine or 1-n-butylbiguanide,which occurs as a solid at 23° C., was used as the silanol condensationcatalyst, no bleedout was found and the curability was good in each case(Examples 3 and 4). On the contrary, when 1-(o-tolyl)biguanide having anaryl substituent was used, the curability was inferior (ComparativeExample 2). When DBU, which occurs as a liquid at 23° C., was used,bleeding out occurred and the curability was also inferior

COMPARATIVE EXAMPLE 3 EXAMPLES 5 TO 7 AND COMPARATIVE EXAMPLES 4 TO 8

To 100 parts by weight of the trimethoxysilyl group-terminatedpolyoxypropylene polymer (A-2) obtained in Synthesis Example 2 wereadded 50 parts by weight of surface-treated colloidal calcium carbonate(product of Shiraishi Kogyo, Hakuenka CCR) and 50 parts by weight ofground calcium carbonate (product of Shiraishi Calcium, Whiton SB), anda chief material was prepared in the same manner as mentioned above. Tothe chief material were added 3 parts by weight ofγ-aminopropyltrimethoxysilane (product of Dow Corning Toray, A-1110) asan adhesiveness imparting agent and an amount (in parts by weight)specified in Table 3 of each amine compound specified in Table 3 as asilanol condensation catalyst, and the resulting composition wassubjected to skinning time measurement and bleedout evaluation in thesame manner as in Example 1.

Further, each compound was brought into close contact with an adherendsubstrate (glass, stainless steel or vinyl chloride resin) to attain anapproximate size of 3.0 cmin length×1.5 cm in width×1.0 cm in thicknessand cured under constant-temperature and constant-humidity conditions of23° C. and 50% for 7 days, followed by adhesiveness evaluation by90-degree hand peel testing. The adhesiveness evaluation was made interms of mode of failure: when the cohesion failure percentage was notlower than 80% and up to 100%, the adhesiveness was evaluated as“Excellent”, when that percentage was not lower than 20% but lower than80%, as “Good” and, when that percentage was lower than 20% to 0%, as“Poor”. Further, the state, at 23° C., of each amine compound used wasobserved by the eye and judged as “solid” or “liquid”. The results areshown in Table 3.

TABLE 3 Example Comparative Example 5 6 7 4 5 6 7 8 Chief Organic A-2100 100 100 100 100 100 100 100 material polymer (A) Calcium HakuenkaCCR 50 50 50 50 50 50 50 50 carbonate Whiton SB 50 50 50 50 50 50 50 50Adhesion promoter (C) A-1110⁽¹⁾ 3 3 3 3 3 3 3 3 Amidine1,5,7-Triazabicyclo[4.4.0]dec- 0.5 compound or 5-ene solution⁽²⁾guanidine 1-n-Butylguanidine solution⁽³⁾ 4 compound (B)1-n-Butylbiguanide solution⁽⁴⁾ 4 Amine compound 1 -(o-Tolyl)biguanide 3DBU⁽⁵⁾ 2 DBN⁽⁶⁾ 2 Diethylenetriamine 4 Triethylamine 4 State of aminecompound at 23° C. Solid Solid Solid Solid Liquid Liquid Liquid LiquidResults Bleedout No No No No Yes Yes Yes Yes Curability (skinning time)14 min 5 min 8 min 35 min 28 min 43 min 55 min ≧24 hrs AdhesivenessGlass Excellent Excellent Excellent Excellent Excellent Excellent Good —(90° hand Stainless Excellent Excellent Excellent Excellent Poor PoorPoor — peel) Vinyl chloride Excellent Excellent Excellent Excellent PoorPoor Poor — ⁽¹⁾A-1110: γ-aminopropyltrimethoxysilane⁽²⁾1,5,7-Triazabicyclo[4.4.0]dec-5-ene solution: 67% solution of1,5,7-Triazabicyclo[4.4.0]dec-5-ene in methanol ⁽³⁾1-n-Butylguanidinesolution: 50% solution of 1-n-butylguanidine in methanol⁽⁴⁾1-n-Butylbiguanide solution: 50% solution of 1-n-butylbiguanide inmethanol ⁽⁵⁾DBU: 1,8-diazabicyclo[5.4.0]undec-7-ene ⁽⁶⁾DBN:1,5-diazabicyclo[4.3.0]non-5-ene

As shown in Table 3, when 1,5,7-triazabicyclo[4.4.0]dec-5-ene,1-n-butylguanidine or 1-n-butylbiguanide, which occurs as a solid at 23°C., was used as the silanol condensation catalyst, no bleedout was foundand the curability and adhesiveness were good in each case (Examples 5to 7). On the contrary, when 1-(o-tolyl)biguanide having an arylsubstituent was used, the curability was inferior (Comparative Example4). When DBU, DBN, diethylenetriamine, or triethylamine, which occurs asa liquid at 23° C., was used, bleeding out occurred and the curabilityand adhesiveness were also inferior (Comparative Examples 5 to 8).

EXAMPLE 8 AND COMPARATIVE EXAMPLE 9

Ground calcium carbonate (product of Shiraishi Calcium, Whiton SB; 75parts by weight) and 75 parts by weight of ground calcium carbonate(product of Bihoku Funka Kogyo, PO₃₂₀B10), 25 parts by weight of talc(product of Fuji Talc Industrial, PKP-80), 25 parts by weight ofballoons (product of Taiheiyo Cement, SL-150) and 5 parts by weight of aplasticizer (product of Mitsui Takeda Chemicals, Actocol 21-56K) wereweighed and added to 100 parts by weight of the methyldimethoxysilylgroup-terminated polyoxypropylene polymer (A-3) obtained in SynthesisExample 3, and the resulting mixture was thoroughly kneaded and thenpassed through a three-roll paint mill for dispersion. Thereafter, themixture was dehydrated under vacuum at 120° C. for 2 hours and, aftercooling to 50° C. or below, two parts by weight of vinyltrimethoxysilane(product of Dow Corning Toray, A-171) as a dehydrating agent, 1,5 partsby weight of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (product ofDow Corning Toray, trademark: A-1120) as an adhesiveness impartingagent, 25 parts by weight of methanol as an organic solvent and anamount (in parts by weight) specified in Table 4 of each amine compoundspecified in Table 4 as a silanol condensation catalyst wererespectively added to the mixture, and the whole mixture was kneaded inthe substantial absence of moisture and then packed in a moisture-proofcontainer. Thus was obtained a one-pack curable composition.

The above curable composition was spread over a polyethylene sheet to athickness of about 3 mm and the surface was smoothened underconstant-temperature and constant-humidity conditions of 23° C. and 50%.This point of time was regarded as the time of the start of curing andthe skinning time, namely the time required for the surface of thecompound to become no longer sticky when touched with a spatula, wasmeasured. Further, the adhesion strength was measured in terms of90-degree peel strength according to JIS A 5536:2003. The curablecomposition was applied onto a slate board using a notched trowel and,after the lapse of each respective open time, a Tajima, Inc. vinyl floorsheet, AC Floor 28 (corresponding to JIS A 5705 vinyl floor sheet DO)was put on the curable composition. After 48 hours of curing underconstant-temperature and constant-humidity conditions of 23° C. and 50%for 48 hours, the whole was subjected to peel strength measurement. Theresults are shown in Table 4.

TABLE 4 Example Comparative 8 Example 9 Organic polymer (A) A-3 100 100Calcium carbonate Whiton SB 75 75 PO320B10 75 75 Talc PKP-80 25 25Balloons SL-150 25 25 Plasticizer Actocol 21-56K 5 5 Dehydrating agentA-171⁽¹⁾ 2 2 Adhesion promoter (C) A-1120⁽²⁾ 1.5 1.5 Amidine compound1-n-Butylbiguanide 2 or guanidine solution⁽³⁾ compound (B) Aminecompound 1-(o-Tolyl)biguanide 2.5 Organic solvent Methanol 25 25Curability (skinning time) 30 min 5 hrs 90-Degree peel Open time 10 min.30 15 strength (N/25 mm) Open time 20 min. 20 17 Open time 30 min. 15 14Open time 40 min. 8 12 ⁽¹⁾A-171: vinyltrimethoxysilane ⁽²⁾A-1120:N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane ⁽³⁾1-n-Butylbiguanidesolution: 33% solution of 1-n-butylbiguanide in methanol

As shown in Table 4, when 1-n-butylbiguanide was used as the silanolcondensation catalyst, the curability and the adhesion strength weregood in each case (Example 8). On the contrary, when 1-(o-tolyl)biguanide having an aryl substituent was used, the curability and theadhesion strength were inferior

COMPARATIVE EXAMPLE 9

The amine components shown in Tables 1 to 4 were as follows.

-   -   1,5,7-Triazabicyclo[4.4.0]dec-5-ene solution: A 67% solution of        1,5,7-triazabicyclo[4.4.0]dec-5-ene (product of Sigma-Aldrich        Corp.) in methanol was prepared and used.    -   1-n-Butylguanidine solution: Equimolar amounts of        2-methylisourea hydrochloride (product of Lancaster) and        butylamine (product of Wako Pure Chemical Industries) were        heated under reflux in methanol as a solvent for 2 hours and the        resulting mixture was neutralized with a methanol solution of        sodium methoxide to give 1-n-butylguanidine. A 50% methanol        solution of this 1-n-butylguanidine was prepared and used.    -   DBU: 1,8-diazabicyclo[5.4.0]dec-5-ene (product of San-Apro)    -   1-Butylbiguanide solution: 1-n-Butylbiguanide hydrochloride        (product of Wako Pure Chemical Industries) was neutralized with        an aqueous solution of sodium hydroxide to give        1-n-butylbiguanide. A 50% methanol solution of this        1-n-butylbiguanide was prepared and use.    -   1-(o-tolyl)biguanide (product of Tokyo Kasei Kogyo)    -   DBN: 1,5-Diazabicyclo[4.3.0]non-5-ene (product of San-Apro)    -   Diethylenetriamine (product of Tokyo Kasei Kogyo)    -   Triethylamine (product of Tokyo Kasei Kogyo)

INDUSTRIAL APPLICABILITY

The curable composition of the invention is usable for pressuresensitive adhesives, sealants for buildings and constructions, ships,automobiles and roads etc., adhesives, framing agents, materials forvibration absorption, materials for vibration suppression, materials fornoise reduction, foamed materials, paints, spraying materials and thelike. The curable composition of the invention is more preferable to beused as sealants or adhesives among them since the cured productobtained by curing the composition is excellent in flexibility andadhesion.

Further, the curable composition is usable for various uses, for exampleelectric and electronic parts such as sealants for rear faces of solarcells; insulating materials such as insulating coating materials forelectric wires and cables; elastic adhesives, contact adhesives,spraying sealants, crack repairing materials, adhesives for tiles,powdery coating materials, casting materials, rubber materials formedical use, pressure sensitive adhesives for medical use, sealants formedical appliances, packaging materials for food, joint sealants forexterior materials such as a siding board, coating materials, primers,conductive materials for shielding electromagnetic wave, heat conductivematerials, hot melt materials, electric and electronic potting agents,films, gaskets, various kinds of molding materials, rustproof andwaterproof sealants for end faces (cut sections) of net glass orlaminated glass, liquid sealants used in automobile parts, electricparts, various kinds of machine parts and the like, and the like.Further, since the curable composition can be closely stuck to a widerange of substrates such as glass, ceramics, wood, metals, and resinmolded products by itself or with assist of a primer, it is also usableas various types of hermetically sealing compositions and adhesivecompositions. The curable composition of the invention may be used asadhesives for interior panels, adhesives for exterior panels, adhesivesfor tiles, adhesives for stone material lining, adhesives for ceilingfinishing, adhesives for floor finishing, adhesives for wall finishing,adhesives for vehicle panels, adhesives for assembly of electricapparatus/electronic apparatus/precision apparatus, sealants for directgrading, sealants for pair glass, sealants for SSG process, sealants forworking joints of buildings and constructions, and the like.

1. A non-organotin-based curable composition which comprises: (A) anorganic polymer having a silicon-containing group capable ofcrosslinking by siloxane bond formation, wherein the (A) componentorganic polymer is at least one polymer selected from the groupconsisting of polyoxyalkylene polymers, saturated hydrocarbon polymersand (meth)acrylate ester polymers, (B) a biguanide compound representedby the general formula (4):R¹⁰N═C(NR¹¹ ₂)—NR¹²—C(═NR¹³)—NR¹⁴ ₂  (4) (wherein R¹⁰, the two R¹¹moieties, R¹², R¹³ and the two R¹⁴ moieties each independently is ahydrogen atom or a non-aryl monovalent organic group; any two or more ofR¹⁰, the two R¹¹ moieties, R¹², R¹³ and the two R¹⁴ moieties may bebound together to form a ring structure) and/or the general formula (5):R¹⁵N═C(NR¹⁶ ₂)—N═C(NR¹⁷ ₂)—NR¹⁸ ₂  (5) (wherein R¹⁵, the two R¹⁶moieties, the two R¹⁷ moieties, and the two R¹⁸ moieties eachindependently is a hydrogen atom or a non-aryl monovalent organic group;any two or more of R¹⁵, the two R¹⁶ moieties, the two R¹⁷ moieties andthe two R¹⁸ moieties may be bound together to form a ring structure). 2.The non-organotin-based curable composition according to claim 1 whereinthe guanidine compound is a guanidine compound represented by thegeneral formula (2) wherein any two or more of R⁴, the two R⁵ moietiesand the two R⁶ moieties are bound together to form a ring structure. 3.The non-organotin-based curable composition according to claim 1,wherein the guanidine compound represented by the general formula (2) isa cyclic guanidine compound represented by the general formula (6):

(wherein R¹⁹ is a divalent organic group and the two R²⁰ moieties andR²¹ each independently is a hydrogen atom or a non-aryl monovalentorganic group; any two of the two R²⁰ moieties and R²¹ may be boundtogether to form a ring structure).
 4. The non-organotin-based curablecomposition according to claim 1, wherein the polyoxyalkylene polymer isa polyoxypropylene polymer.
 5. The non-organotin-based curablecomposition according to claim 1, wherein the main chain skeleton of thepolyoxyalkylene polymer is composed of hydrogen atoms, carbon atoms andoxygen atoms alone.
 6. The non-organotin-based curable compositionaccording to claim 1, which comprises the component (B) in a proportionof 0.001 to 20 parts by weight per 100 parts by weight of the component(A).
 7. The non-organotin-based curable composition according to claim1, which further comprises an adhesion promoter (C) in a proportion of0.01 to 20 parts by weight per 100 parts by weight of the component (A).8. A sealing composition which comprises the non-organotin-based curablecomposition according to claim
 1. 9. An adhesive composition whichcomprises the non-organotin-based curable composition according to claim1.